regionset’s homepage appears to have disappeared. If your distro no longer packages it, the source can still be obtained from Gentoo source mirrors (pick a server here and go into “distfiles” then “8b”).

Because even a headless server with no email capability can write to a log, as long as it can mount its root drive.

That being said, if your system is hiding stuff behind some kind of splash screen at boot time, turn it off. I suspect your error would have been right there on screen in plain white-on-black text if it had happened on one of my systems (granted, I use OpenRC and not systemd, but I expect the latter also provides a running commentary on what it’s doing at boot until the graphics stack loads).

noauto, which means that the filesystem in question won’t mount until you issue an explicit mount command for it, can be an alternative to nofail in fstab. Back in the days of optical drives, that used to be one of the options you put on them.

For external (and network) drives, though, I find it’s better to hand the problem over to autofs (which will mount the filesystem only when you try to access it) and keep them out of fstab.

You can try just tracking down Akonadi’s executable and removing its executable mark or renaming it, which may, however, break other stuff (in particular, make sure you’re not running kmail—it seems to be the most substantial program with a non-optional dependency). Or you can ditch KDE and move to a lighter DE that doesn’t have this stuff (TDE, Mate, XFCE . . .)

There are two ways to spin up a Linux machine: you can either use a desktop-ready distribution that includes everything you need to use it right away (including some stuff you don’t want), or you can start with the bare bones and build it up to usability. If you want to take the second philosophy to the extreme, Gentoo will let you turn off all optional features you don’t want before they’re even built.