Almost always this is a player issue as mentioned. I’ve had similar issues with some files where audio just doesn’t work on one player but works fine for another. Same with subtitles. Set to an external player like VLC and see if that fixes it. (For what it’s worth, I mostly access Jellyfin from my Chromecast and I have it set to prompt me for a player each time I start watching something, one of them always works but for my files it isn’t consistent which)
There’s no reason that standard should be MATLAB though.
I can’t speak to OP’s field, but in my field (automotive and electrical engineering) and even within my company, MATLAB and Simulink are heavily used. The reason it’s the standard is that it’s an industry standard. MATLAB on my resume almost certainly got me the foot in the door for my first job.
YMMV on if you could get an employer to let you use a different software, but big companies tend to be very protective of IP and are wary of that.
I found what really helps Jellyfin on my Chromecast is setting the player manually. There’s a setting to make it ask which player to use when starting a show and if one doesn’t work, 99% of the time the other one works fine.
Sometimes switching players doesn’t fix subtitles for me, in those situations I usually have to toggle subs a few times or restart the stream and they actually work.
In my opinion it’s a minor enough inconvenience given Jellyfin is 100% free and open source, whereas Plex is tracking you and charging you. But of course maybe your media is in some more difficult format than mine.
It was a bug in that version of the distro IIRC, trying to install Steam would instead try to install the SteamOS desktop environment (or something along those lines). It has since been fixed to actually install the Steam client.
Obviously it was a bit silly he typed “Yes, do as I say” after seeing the message, but he was also literally following exactly what all the online guides said to do (other than the “Yes do as I say” part). Luckily it’s fixed now but I do think it was a really good demonstration of what the video wanted to see: “What might the average non-techie gamer face using Linux?”