During boot, with pre-systemd versions of Ubuntu server (eg. 14.04), if a non-critical fstab disk was offline, the system would wait to mount the disk (30s iirc), timeout and continue booting.
Since upgrading through 16.04 to Ubuntu 18.04, thanks to systemd's dependencies I presume, a missing fstab disk stops the boot process resulting in the "Emergency mode… Press Enter for Maintenance" prompt at boot time.
- Is there a way to change this behaviour by default? Ie. simply continue booting or an option to flag disks as non-critical?
- Failing that, is there a straightforward systemctl command to 'continue booting ignoring missing disk' from maintenance?