Feed (1002)

I'm playing with Metabase and it seems awesome. The paid features aren't bugging me a whole lot for personal use. I think I want to use it at the lease to explore my disc golf data vs doing it all manual in #astrojs with manual sql queries or with #sqlmesh.

The publishing option seems really powerful, and simple. It brings the interactivity I want.

I may play with Apache Superset but we shall see, the UX of Metbase is fantastic.

Worry is the misuse of the imagination

Dan Zadra

Watched a Minecraft Movie

#movie

I'm trying out this #obsidian plugin: https://github.com/ivan-lednev/obsidian-day-planner

Here are my settings that I prefer. Notice that the empty string is needed to search through all the files in your vault looking for "scheduled" date.

I also added my personal Google calendar and my work calendar, super nice seeing all in one: work, personal, obsidian tasks.

#temporal solves another use case for me: I wanted a way to put my computer to sleep via my phone.

I have my Next.js web app starting the workflow and a GoLang worker running on the machine and listening to the respective queue to put it to sleep.

I didn't want to have the machine or the worker already offline, come online, and then get put right back to sleep via a pending workflow. Or maybe I accidentally put it to sleep a few times via the web app.

The solve is using workflow execution timeout along with limiting maximum attempts to one solves this! If no worker completes the workflow within a minute it times out and won't get executed. I think this is an awesome solve for the potential issues above.

    await client.workflow.start('WorkflowSleep', {
      workflowId: `gotosleep-${nanoid()}`,
      taskQueue: 'GREETING_TASK_QUEUE',
      workflowExecutionTimeout: '1m',
      retry: {
        maximumAttempts: 1
      }
    });

I'm debating switching to Youtube music + ad free Youtube instead of #spotify since I switched listening to podcasts via #audiobookshelf

Edit: Oh wait, I forgot that Spotify gives you #audiobook listening hours included...

As I'm a big fan of #discgolf. I wanted to follow https://www.youtube.com/@JomezPro via RSS. I remembered that Youtube had RSS but you needed to find the channel id by going through dev tools. First result on google was using rss.app... don't recommend.

I forgot, that my awesome #rss feed reader, https://www.usememos.com/ knows how to find RSS feeds on Youtube! So go to add feed, paste in the Youtube channel and voila, your good to go!

I resonate with with the #quote by https://github.com/theprimeagen (summarized):

High school is such a blip in your life, it is insignificant, but while your in it, it doesn't feel that way

Finished listening to The Assassin's Blade #audiobook. https://www.goodreads.com/book/show/126062562-the-assassin-s-blade

#til https://www.merriam-webster.com/dictionary/myopic

I printscreen a lot and I've been using the #moonlander keyboard without it for too long. I finally saw how to add it here. It is called SysReq.

Since I use #audiobookshelf mainly for podcasts I never noticed bookmarks when listening to audiobooks. I wish it was for podcasts too, but I'm glad its there for audiobooks.

Searching for files in #obsidian was driving me crazy as the first result would be a file that didn't exist. I only wanted files that already exist in the type ahead since I could ctrl+n for a new note.

I finally found the setting to change that behavior:

Listened to Motivated to Learn with Adriana Villela and had some notes:

• I really agree with brain teaser questions discussion - I'm not compatible and didn't showcase my problem solving


• Slow down interviewing


• You have to boil someone down to numbers... this sucks

Haven't cleaned up docker in a while, saved ~69GB!

Changed my Chrome browser's default search to SearXNG following this article. Shall see how it goes!

I just learned that the Raindrop.io chrome extension can save multiple tabs if you right click on it. It gives an option to close the tabs as well! #howto

Eggs are fantastic using egg rings (I have different ones) on the #blackstone

I tried using imagekit.io back i n 2022 - 2023 but it never stuck for my personal #website. I wasn't blogging much and I needed a simpler way to handle images.

Well... I needed to figure out my image workflow in the firstplace.

There is something about the #iot and architecture feel of the desktop and mobile Bambu #3dprinting apps that make it feel so good and makes me want to work on side projects with similar design.

Watched The Fall Guy (2024) and I thoroughly enjoyed it.

Image source: Rotten Tomatoes

#movie

I wanted to render my canvas file from #obsidian on my #astrojs website but I haven't found a good way to render jsoncanvas.

I tried ChatGPT as well and it hallucinated a npm library:

import JSONCanvas from "jsoncanvas";

Take a delayed screenshot with Flameshot: #cli

flatpak run org.flameshot.Flameshot gui -d 3000

For the first time that I can remember, I was able to touch my toes when stretching while sitting.

I've been working on flexibility for a while.

Kind of nice to happen on the first of the year!

#fitness

As I start to think about DNS entries for my private home network I never considered #nextdns. I briefly looked into Tailscale but that wasn't appropriate. I may look into Cloudflare, but I have a bigger initiative to get that more under IaC.

Looks like you can create #dns entries!

I think I want old school badges on my website at some point...

• https://web.badges.world/#


• https://cyber.dabamos.de/88x31/index.html


• https://hekate2.github.io/buttonmaker/

I thought I would give vanilla React 19 server components a quick spin with this article but got failures just installing dependencies. I think I'll hold off and let Next.js take the reigns for Server Components and React.

#til that #1password has a security questions feature and will randomly generate answers. Good stuff.

I was putting them in secure notes up to this point 🤷

#til that Google Apps Script exists. I was #chatgpt 'ing and wanted an incredibly easy way to know my gmail unread count. This is so easy... I can make it unauthenticated as well. So now I can call a URL in my web app and give myself an easy reminder that I have unread email. My response is simple:

{"unreadCount":3}

I somehow got my hands on a Adafruit Feather M0 WiFi with uFL - ATSAMD21 + ATWINC1500 long ago and just found it. I saw this:

Please note, there are no CircuitPython/MicroPython drivers for the WINC1500 (and there are no plans to make any).

So that limits my uses as I have to devote so much time to c++ otherwise.

#iot #microcontroller

I've been a bit unpleased with my Pixel 6 Pro battery life, but it is older. It took me a while but I had to Google how to remove device protection as a $150 deductible for another new or used replacement didn't sit well with me: https://support.google.com/fi/answer/6397665?hl=en#zippy=%2Ccancel-coverage

#phone

Moving the desk lamp made a lot of sense. #office

Got a new black https://www.zsa.io/moonlander split #keyboard ... it is a lot to get used to but I am excited!

#office

Got a #fortunecookie:

A bold and daring adventure is in your future.

#chatgpt made it so easy to use #1password to get environment variables safely in a Makefile: https://chatgpt.com/share/675490fe-f24c-800c-b355-d3334d8b23e6

If you try to use an auto incrementing column type in #nocodb like serial, make sure you check NN for not nullable. Otherwise you'll get an error. #chatgpt helped, I didn't want to think.

How to fix chrome failing from starting and not knowing why: run google-chrome and saw the error:

Chrome has locked the profile...

Fix

rm -rf ~/.config/google-chrome/Singleton*

I used the default screenshot tool in Pop OS for a long time until I wanted to be able to draw boxes easily like Snagit. Flameshot is fantastic for this, will continue to use it.

#til in #obsidian you can right click, extract selection, and shift+enter to add to the beginning of a note. I was doing manually copy pasting with two tabs or clicking over to the note. So much easier.

Yes it's mouse driven, don't judge me 😉

I'm thinking of some disc golf + badge-ing page(s) on my website. I really like Open AI's generation of this:

Window functions in #sql hurt my brain. I wanted to know what my current streak was of doing something.

Search History

• postgresql - records from yesterday in postrgesql - Stack Overflow


• postgresql - Show current row "win streak" - Database Administrators Stack Exchange


• postgresql - Select longest continuous sequence - Database Administrators Stack Exchange


• sql - Conditionally reset row\_number - Stack Overflow


• sql - Postgres create id for groups - Stack Overflow


• PostgreSQL ROW\_NUMBER() Explained with Practical Examples


• PostgreSQL LAG() Function By Practical Examples


• PostgreSQL ROW\_NUMBER() Function With Examples - CommandPrompt Inc.%E2%80%9D,which%20ROW_NUMBER()%20is%20applied.)


• postgresql - Sum the “previous row” value with existing row value in a SELECT statement - Stack Overflow


• Row number with reset in PostgreSQL - Database Administrators Stack Exchange


• sql server - For absolute performance, is SUM faster or COUNT? - Database Administrators Stack Exchange


• sql - Generating time series between two dates in PostgreSQL - Stack Overflow

I was needing to start a #temporal workflow written in Golang from Typescript (NextJS). I saw this or this but was concerned I would need duplicate workflow definitions across languages... which wasn't a correct thought.

I then saw this beautiful solution that only needs the name of the workflow to start it, worked like a charm 👌

Unfortunately, I cannot find a way to add a tag to multiple notes in #obsidian 🤷 I've tried a few plugins to no avail. I didn't have enough notes to warrant a script to do this, so I hand jammed.

Search History

• Plugins - Obsidian


• pjeby/tag-wrangler: Rename, merge, toggle, and search tags from the Obsidian tag pane


• technohiker/obsidian-multi-properties: Plugin for Obsidian that allows user to add properties to multiple notes at once.


• Anyway to add a tag to many notes at once? : r/ObsidianMD

When needing to deploy #lk (GO binary) I was doing the following:

1. Git commit


2. Git tag & push


3. ssh to my server


4. Turn off systemd service and run a Powershell script (that pulled from Github releases and unzipped the binary)

This seems a bit like overkill for personal projects / homelab.

In 907000f I updated my makefile to build and scp the binary to my server.

Currently I have to ssh and manually turn off the service, but I'll add that to the makefile in time.

Goes to show simple commands like scp that have been around for decades are obviously useful.

Wikipedia does say that scp is depracated for rsync; that is fair. But I'm KISS.

I'm such a hypocrite 😅 I was a little frustrated that I couldn't find a RSS feed for Turso but my own website doesn't have one... 🤷

I do have creating one on my to do list.

I saw an alternative note taking app, not that I was looking: Trilium.

It really had me considering trying it out from Obsidian even though I have no quarrels with Obsidian, other than paying for Sync, which I'm happy to.

But I see it's in maintenance mode. Not a problem, but moving on. #adr

Finished listening to Iron Flame #audiobook . It's great.

https://www.goodreads.com/book/show/90202302-iron-flame

After I switched my domain nameservers to Cloudflare I noticed Chrome not resolving my domain.

Then, after incorrectly thinking I needed a redirect (that would be a nice to have, not the issue), I realized I needed a DNS record.

Look at that, Cloudflare even recommends you add one. The other screenshot shows it good to go.

Finished Fourth Wing by Rebecca Yarros #audiobook

Big fan.

Not quite #chatgpt but Warp terminal + AI just made this so easy for me to count how many markdown files in a directory.

It could be simplified for sure, but staying in the terminal and running the commands it gave me easily and safely; fantastic.

#til that in Obsidian you can just embed a note in another... I've been creating daily files (using rollover daily todos) that would copy the dataview queries into each note.

I have been enlightened.

I'm a huge fan of Obsidian as my primary note taking and productivity app.

But, sometimes I do get bored and want to use a CLI to deal with markdown.

You could use Neovim: sudo apt install neovim

The folks at charm_ do make fantastic CLI tools, namely glow. This gives a semi similar experience to Neovim but tailored to markdown; beautiful.

Don't forget to change your default editor in your ~/.bashrc: export EDITOR="nvim"

#cli

#chatgpt does does a good job at helping with #postgres SQL JSONB and sub-arrays:

SELECT *
FROM your_table
WHERE meta -> 'Tags' @> '"cool-tag"'
  AND (meta ->> 'Situps')::int = 0
  AND (meta ->> 'Pushups')::int = 0;

(Notice the double quotes inside a single quote)

Citrix Workspace app is garbage on Linux. I've tried it on Ubuntu and Pop OS.

If you do install it, there seems to be authentication issues.

I think it is easier to just go to your Citrix web URL in your browser, open your session, it will download an .ica file and it opens up like a champ.

Just learned about Deno - that it is a serious project by co founder of Node and can compile to one file! It may sway me away from a Go cli...

I allowed my website: https://live.lkat.io/ to be accessed without Cloudflare login. The Cloudflare policy needed to be like the image below. I switched to Nextauth to control accessible pages because:

• I don't want 2 websites - for example a dynamic admin site I need to log in vs a static generated public site (the issue there is I want to show data, not just markdown)


• I couldn't figure out a way for Cloudflare to lock down certain routes - plus, with NextJS, I imagine there are issues with client side routing as well


• I want to keep things simple by having one website

I was also able to lock down that only my email could log in.

This Medium article was a nice tutorial.

I updated my cli #lk update script to support linux. I decided to use Powershell as it was the lowest common denominator: available on windows and linux.

Search History

• Installing PowerShell on Debian - PowerShell | Microsoft Learn


• database - i want to execute a .ps1 powershell script in red hat linux server - Stack Overflow


• Determine the OS version, Linux and Windows from Powershell - Stack Overflow


• Ternary operator in PowerShell - Stack Overflow


• Create a temporary directory in PowerShell? - Stack Overflow


• New-TemporaryFile (Microsoft.PowerShell.Utility) - PowerShell | Microsoft Learn

I recently was thinking about an easier way to get access to my Udisc scorecards CSV; which is only available via the mobile app.

I started looking into tailscale - especially taildrop. It works via sharing from Android to my linux server!

Although, the command needs ran on the linux side: sudo tailscale file get .. This seems to block when there are no pending files. I'm not sure how long "pending" files live out there either or how long this command will wait for files to be sent. I'm not sure if I should run this every x minutes or if that is a bad idea. Not sure the most efficient way.

Why tailscale? From what I can tell you need a 3rd party app on your mobile phone to share to. I can't download the CSV to my phone downloads either. And you can't share to Chrome/website or an S3 bucket.

So tailscale is a 3rd party app that seems to work for now until I find something easier. I'll have to get the file on the server, either via some kind of eventing or polling and process them...

(Oh yeah, don't forget to update: sudo apt update tailscale)

#til I just learned you can make a clickable image in markdown here. I wanted to be able to click an image and it shows the full size image. Beautiful.

#pic Troy living his best life

Listened to From Chef to System Initiative (Changelog & Friends #55). I like these quotes:

1:39:50 I care about how my family goes forward in the world and what their lives are like

I care how I spend my time ... I need work that is compelling, I need to care, I need to believe that the heart of it is worth doing, because I want to play that game because it is the funnest game I've ever played

#podcast

#pic Troys first fish... well I caught it, so will have to post again when he catches his first one.

AT&T has been my dad's cell phone provider forever. We decided that he was paying too much and decided to move him over to Google Fi with me. He's going from around \$70 for just calls and messaging to \$40 for unlimited everything.

He has an older Moto g7 Play Android phone. Long story short we couldn't unlock it even though we were eligible. Spent an hour or two on support with AT&T.

Turns out the issue was the Unlock app doesn't support Android 9. This Reddit post comment was the fix.

After installing the Lenovo application, I reset the phone, it installed the latest and greatest Android 10, I updated the Unlock app via the Play Store, and low and behold it unlocked and we could go forward migrating his number over. #howto #dad

I've owned a GoPro Hero 5 Black for a long time, I use it sparingly. I recently had the idea to make a timelapse of us setting up our camp on our annual Kayak/Camp trip: #todo

The frustrating part is I don't know when it dies so we can miss a lot of footage.

I did a little searching and saw that this article says: just turn the beep noise to high. That way when the GoPro turns off from low battery, you actually can hear it. Simple. Easy.

I'll have to follow up on how well it works in the future.

#gopro

Tags went missing in usememos (this app) but found how to fix: https://github.com/usememos/memos/issues/3502

My refresh button is here though:

Listened to the Joe Rogan podcast #2180 - Jordan Peterson. A few quotes really resonated with me:

2:12:30 If you think there are no monsters, you're naive and willfully blind to the point of delusion and ... there are none so blind as those that will not see

2:13:48 - What you need in a father, someone who encourages intelligent upward aiming sacrifice and an orientation towards others ... reward for delay of gratification

2:15:54 - I didn't say you should, you must, you ought ... I said there is no difference between responsibility and adventure ... the heavier the responsibility the more profound the adventure

2:17:00 - You want to get your life together, take the path of maximum responsibility ... not because you should, that's not why ... it's because that's the pathway of maximum adventure

2:17:25 - What is the meaning of life - it is the meaning that reveals itself when you take the pathway of maximum responsibility ... the greatest possible treasure is to be found where the danger is most intense ... if there is a dragon, there is a treasure somewhere

#podcast

I somehow was using an old version of go for my lk cli and goreleaser was complaining about some error in GitHub actions. After updating Go it runs pretty fast in GH Actions, about 1m 30s. I wonder if running again if caching will make it faster 💪

Creating a temporal scheduled workflow took a little bit of getting used to. Will give more details later on.

Search history:

• Run tests | GoLand Documentation


• MinIO Go Client API Reference — MinIO Object Storage for Linux


• Schedules - Temporal Go SDK feature guide | Temporal Documentation


• documentation/sample-apps/go/features/schedules/create/main.go at main · temporalio/documentation


• Schedules - Temporal Go SDK feature guide | Temporal Documentation


• Temporal: how do I check if a workflow has already started - Community Support - Temporal

Dealing with OPML took me a bit in Next.JS:

• slash pages


• opml-generator - npm


• API Reference


• opml-to-json - npm


• opml - npm


• types opml - Google Search

Adding code syntax highlighting to Next.JS is insanely simple with bright.

I started with this StackOverflow then did another Google search to find it.

It took 20 days to get my wife's and my passport when we paid for expedited processing. Not too bad. It's weird, the plastic used in the passport seems way more durable than my ID.

I think I'll redo my static website from Quartz to AstroJS and not use NextJS to not reinvent the wheel. My plan is to move my public content outside of Obsidian to decouple my static site content from the static site generators.

• ObsidianHtml/Documentation


• obsidian-html/obsidian-html: Python code to convert Obsidian notes to proper markdown and optionally to create an html site too.


• zoni/obsidian-export: Rust library and CLI to export an Obsidian vault to regular Markdown


• Building a blog with Next.js 14 and React Server Components

I noticed when playing with markdown in Webstorm that an image wasn't resolved. This article turned me on to marking the AstroJS public folder as a "resource root". Now things resolve 💪

#quote

• Some people die at 25 and aren't buried until 75. - Benjamin Franklin


• Airports see more sincere kisses than wedding halls. The walls of hospitals have heard more prayers than the walls of churches.

Sometimes Dapper's behaivor when your querying for one value can act a little unexpectedly. This turned me onto this - needing to coalesce when your SQL query doesn't return anything. So if you want an int and your query doesn't return any results, coalesce will give you a result which makes Dapper happy.

I was wanting to play with https://contentlayer.dev/ and see if I could get something working as a POC quickly...

It seems https://nx.dev has gotten me again. Contentlayer needs your tsconfig to have a baseUrl: "." and that seems to make things go ary. I did set it and "building" is happy but at runtime I'm getting a @neondatabase\serverless error:

Cannot read properties of undefined (reading 'Client')

I really want to use Contentlayer to have an all in one website: dynamic website + static-ish blog. It seems I need to choose between nx.dev or not trust this shiny new software...

Update: I just saw that the last commit was 8 months ago and that there was an issue not supporting Next 14. Definitely too shiny, I need to not mess with this.

Watched the movie Damsel) - 2024. I'm a fan of dragons the one on here was pretty realistic. From the type of fire to the wind it produces.

Didn't have the craziest plot but it took a turn I really enjoyed. I do think Sean Connery in Dragonheart as the dragon's voice is still the best but this one was not too shabby.

#movie

Got Go's Viper working in a container by mounting a config file instead of environment variables.

docker run -v C:\users\looni\.lk.yaml:/config/.lk.yaml lk

Search history:

• loonison101/lk Tags | Docker Hub


• docker - How to mount a single file in a volume - Stack Overflow


• go viper in container - Google Search


• map file to home debian container - Google Search


• Linux Directory Structure Explained for Beginners


• viper automaticenv - Google Search


• linux - start docker container interactively - Stack Overflow


• Docker 'run' command to start an interactive BaSH session

Added a script to update lk, lkat, and worker on windows from the latest release on GitHub.

Search history:

• PowerShell string interpolation syntax - Stack Overflow


• Linking to releases - GitHub Docs


• Expand-Archive (Microsoft.PowerShell.Archive) - PowerShell | Microsoft Learn


• can you symlink pwoershell script - Google Search


• amazon ec2 - Powershell - Why is Using Invoke-WebRequest Much Slower Than a Browser Download? - Stack Overflow


• Write-Host (Microsoft.PowerShell.Utility) - PowerShell | Microsoft Learn

Don't forget to revalidatePath after a serverside mutation in Next.js!!!!!

Was killing me for a while: Docs

A good impact wrench makes working on vehicles so much more enjoyable. You can use a tire under the step ups instead of car jacks for backup.

Working on vehicles sucks, especially seized up caliper bolts

I haven't updated my second brain: https://lanekatris.com for a while. Makes me wonder if I'm doing what works for me. #brain

#til

https://julieblanner.com/how-to-make-garlic-paste/

Is garlic paste the same as minced garlic?

No, it’s not quite the same thing – although it can be used interchangeably in many recipes. Minced garlic is garlic in tiny little uniform pieces, whereas garlic paste is completely pureed.

I feel a little dumb, #til :

Although they both have a mild onion flavor, chives and green onions (aka scallions) are not the same thing

Messenger for desktop on windows was jacked up after an update. Got it from the store and it's good to go:

Finished the first season of Fallout on Amazon Prime. I dig it.

Image Source

I try not to game much of late, but playing Halo Infinite has been tough for me from an aiming perspective. Since playing Fortnite I've been mouse and keyboard, and been using M&K on Halo to stay consistent.

Halo does not feel right with M&K.

I finally gave up yesterday and switched to controller. It felt ridiculous.

But within 2 games I was doing better and had more confidence and my aim was more consistent. Who cares about auto aim, its about your enjoyment.

Halo 3 - the GOAT

I was needing to do a few things to my homelab server:

• Move to a wired network


• Add to UPS


• Install another bigger HDD (4TB)

I wanted to compare my current network speed and after I go wired. I researched and found iperf is a good way to check. Make sure to use the same version: on Ubuntu apt has it as version 2 but my windows download was 3. I was getting some error like: "unexpected control...". Once I was on the same version it worked.

From the wired network perspective, I had a small 8 port gigabit router. So I was just able to move it. My home network is janky because of the old house and its layout.

I can never remember the linux commands to add a HDD. These helped:

• filesystem - How do I view all available HDD's/partitions? - Ask Ubuntu


• How do I add an additional hard drive? - Ask Ubuntu


• UsingUUID - Community Help Wiki


• The best one - InstallingANewHardDrive - Community Help Wiki

Don't forget to smell Spring when you walk outside

Just made a #purchase for a gopro mount to put on my #discgolf cart: https://www.amazon.com/dp/B0789LSSL1

We'll see how it fits!

#changelog I just changed up my disc golf disc list here

Just installed this #obsidian plugin: https://obsidian.md/plugins?id=reveal-active-file-button

It's a simple button to navigate to the file you have open in your file tree. I've been wanting this for a while.

I haven't figured out how to run a SSIS package from CLI yet. Browsing history:

• Run an SSIS package from the command prompt - SQL Server Integration Services (SSIS) | Microsoft Learn


• Run an SSIS package from the command prompt - SQL Server Integration Services (SSIS) | Microsoft Learn


• dtexec Utility - SQL Server Integration Services (SSIS) | Microsoft Learn


• What's new in Reporting Services - SQL Server Reporting Services (SSRS) | Microsoft Learn


• Microsoft Reporting Services Projects 2022 - Visual Studio Marketplace


• How to view the SQL Statement for reports - Configuration Manager | Microsoft Learn

#adr I use Kestra and Windmill.dev to orchestrate things and do low code snippets. I now introduced Next.js -> lkat-api -> Temporal -> worker.exe. This was because I needed access to my local file system.

It was too much of a pain to sync from obsidian to S3 using plugins. So for now, even though I can't do this via mobile, I think Temporal as an orchestrator is working well

When I SSH to my server I wanted to be dropped into a certain folder: my git repo folder that I use for hosting my homelab. This link is what I needed to do. I'll keep a copy of my .bash_profile in git here.

It may seem odd, but having a light up toilet seat that gives just enough light is a quality of life upgrade

#adr I decided to stick with Cloudflare R2 for now compared to Backblaze B2 because I'm already using Cloudflare tunnels - trying to minimize different services used.

We'll see how the cost and S3 compatible API goes.

Just playing around, I wanted to use rclone (directions) to make copying data easy from CLI. Make sure you get the latest version which isn't available on Ubuntu package management.

Been playing with the https://www.warp.dev/ terminal for about 2 weeks now. Seems pretty nice so far. I'm barely using all the features but I haven't had to configure a thing and I'm on my way.

Atuin shell history syncing isn't available on Windows... don't blame them. Works great on my Ubuntu systems