Seems you already figured out the broken fstab yourself. Indeed
upstart/mountall didn't complain about this, and you silently wouldn't
have a swap partition. systemd is more explicit about this, and in
rescue mode or if you boot without splash, or wait long enough you'd
see the error. This is a
** Package changed: xorg (Ubuntu) = systemd (Ubuntu)
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https://bugs.launchpad.net/bugs/1448865
Title:
does not boot with broken UUIDs in fstab
To manage
