systemd fails to boot most of the time

[Teresa e Junior]

>>> Except perhaps a question: are the .device, .mount, or .swap units
>>> auto-generated by systemd or are you providing them under /lib or
>>> /etc?
>
> How could I know this, please? My system is mostly the default, except
> that I had deleted my swap partition, and then later recreated it. Maybe
> the problem is related? But just commenting the swap entry in /etc/fstab
> did not change the problem.

OK, the problem is here indeed. The only fstab entry that really needs 
`noauto,x-systemd.automount` to boot is swap. Maybe when I deleted and 
recreated the swap I have done something wrong in the process, or 
systemd left something like obsolete unit files hanging around...

I can boot now with:
UUID=419caf7b-d856-4668-b02f-e8d0a292e768   none   swap 
sw,noauto,x-systemd.automount   0   0