Using Fedora 24, I had configured in /etc/fstab an external usb drive:
UUID=6826692e-79f4-4423-8467-cef4d5e840c5 /backup/external ext4 defaults 0 0
When I unplugged the usb disk and reboot, it does not boot
That is the error message:
[ TIME ] Timed out waiting for device dev-disk-by\x2duuid-6826692e\x2d79f4\x2d4423\x2d8467\x2dcef4d5e840c5.device. [DEPEND] Dependency failed for /backup/external. [DEPEND] Dependency failed for Local File Systems. [DEPEND] Dependency failed for Relabel all filesystems, if necessary. [DEPEND] Dependency failed for Mark the need to relabel after reboot.
Why does not boot? is it a bug? a feature? of systemd? I know that was a mistake of me, I had to set options to "noauto", but anyway Why booting process stops because a non-critical directory of FHS is missing?