I like how K-9 hooks directly into OpenKeychain for encryption. Does Fairemail do that?

It says it is “a” standard file system - not “the” standard. Very different things.

So for Linux that would be ext4.

It’s worth noting that the default file system varies by distro - there is no ‘Linux’ default. For example, RHEL et al use XFS as the default.

No madness. I know it works natively. I also know it works perfectly well with a rootfull container.

All of my other applications are running in containers and having Plex also run in a container would simplify my overall architecture and recovery, should I need to replace the host.

Not very helpful.

I would suggest looking back through what packages were installed / updated / removed when you performed the -Syu - maybe that will give you a clue.

I tend to use Ubuntu most of the time - because I am familiar with it. Then again I have been using Linux for over 25 years and am a professional Linux Admin - so I am familiar with most of them!