Hello and thank you for reading!
After and update, Ubuntu asked for a reboot. However after this reboot, I can't login anymore : I have a black screen with a black cross as a mouse cursor... Ctrl+Alt+F1 brings a flashing carret then after a minute or so a few errors :
timed out waiting for device /dev/disk/by-uuid/xxxxxxxxxxxxx
Dependency failed for /mnt/xxxxxxxxxxxI didn't find much help online, but tried the nomodeset boot option, with same result.
In case this helps I recently plugged back one hard drive I had removed a while back, and I guess it's the first time Grub updates since that (actually I didn't see grub before, probably because there were no other boot options). But removing that drive doesn't change anything.
71 Answer
In the end I booted from a liveusb, and reinstalled Ubuntu. I didn't format / nor /home so I didn't lose much at all.
