Ubuntu: Boot Failed: Failed to start Remount Root and Kernel File Systems



Question:

I suddenly got my desktop machine to fail booting with no obvious reason. I haven't made any significant changes/updates since the last shutdown. Here is what happens:

Normal boot sequence throws me off to tty1. After successful login:

/usr/lib/ubuntu-release-upgrader/release-upgrader-motd: 31: /usr/lib/ubuntu-release-upgrader/release-upgrader-motd: cannot create /usr/lib/ubuntu-release-upgrader/release-upgrader-available: Read-only file system  /usr/lib/update-notifier/update-motd-fsck-at-reboot: 33: cannot create /usr/lib/update-notifier/update-motd-fsck-at-reboot: Read-only file system    Welcome to Ubuntu 16.04.1 LTS! (<kernel_version>)    0 packages can be updated    0 updates are security updates    *** /dev/sda2 should be checked for errors ***      user@user:^$ _  

Note: Switching to tty7 doesn't work. The screen blanks a little and then that's it

Going through recovery mode and running fsck gives:

recovery_mode_fsck

Issuing the command shown (systemctl ...) through a root shell gives:

command_issued

Any help is appreciated


Solution:1

To check the file system on your Ubuntu partition...

  • boot to the GRUB menu
  • choose Advanced Options
  • choose Recovery mode
  • choose Root access
  • at the # prompt, type sudo fsck -f /dev/sda2
  • repeat the fsck command if there were errors
  • type reboot


Solution:2

For me, this problem appeared after I installed a backup with wrong/old fstab UUIDs. I had to view the right UUIDs with sudo blkid and update my /etc/fstab file accordingly.


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