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After shutting down the PC too many times while the kernel is loading my Ubuntu 18.04 doesn't boot anymore. It falls into emergency mode the grub wasn't showing before:`

enter image description here

The black screen after I select Ubuntu from the grub boot menu:

the screen after I select Ubuntu from the grub

I ran journalctl -xb and this is what I got:

error1

error 2

I don't know what's causing these errors, but after reading some questions here I think that the problem is related to disk partitions. after running cat /etc/fstab:

after running cat /etc/fstab

after running lsblk -f:

after running lsblk -f

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    Looks like you damaged your filesystem. That can happen when you shutdown uncleanly (don't do that anymore). Look up how to run fsck to repair your filesystem. – user535733 Dec 4 '18 at 17:21
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This happened to me too, and it took me a bit of time to realize it was due to a bad entry in my /etc/fstab... I was setting up multiple OSes on different partitions, and at some point one of the partitions' UUID changed, so when I booted a previously working OS, it failed because it didn't find the UUID defined in /etc/fstab.

To fix it I simply commented out using # the unmountable partition, then rebooted. I later was able to remount the desired partition.

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  1. enter root password.
  2. enter mount -a to see where the error is (which line).
  3. enter nano /etc/fstab and comment the missing or uncomment it then save and finally reboot. (for example: comment a line like this UUID =0E52-654D /boot/efi)
  4. enter reboot

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