While I have not created content specifically about Ubuntu, I proudly have been using Ubuntu and derivatives to power my media content creations centered around the R language for statistical computing 
Here are a few of my current productions:
In 2012 I launched the R-Podcast to share practical advice on using R to accomplish innovative statistical analyses and to spotlight the amazing community of package authors and data scientists leveraging R to build new capabilities and generate thought-provoking insights from data. Each episode to date has been recorded on an Ubuntu LTS release (I believe starting with 12.04) with the Audacity audio program.
The Shiny Developer Series is a series of video interviews and screencasts on how to effectively produce web applications powered by R and the shiny package, full of interviews with the developers of Shiny and related packages, as well as those using Shiny in their fields to produce production-grade applications. Plus, I started doing live-streams of my development process. All episodes are produced on Ubuntu or Pop OS with Open Broadcaster Software (OBS) snap package and OBS Ninja to bring remote guests into the recording.
My newest creation is a short audio podcast called RWeekly Highlights, a weekly short 10-15 minute deep dive into the top-voted community blog posts, tutorials, or package updates from the latest RWeekly issue that assembles a curated collection of R and data science resources each week. All episodes are recorded on Pop OS 20.04 with the Reaper DAW.
For my workflows Linux and Ubuntu have opened the doors for me to think big and try new ideas, all while having fun doing it 
(I wanted to add more links but I was limited to only 2)