Dual boot Ubuntu doesn't boot with error "cannot find TOCBLOCK, database maybe corrupt."

At the "recovering journal" error, hit the Enter key to enter maintenance mode, then at the # prompt, type:

journalctl -xb

review the text, and try to identify when/where an error occurred. Take a picture of anything that looks suspect to you, and edit it into your question, if you need more help. Then type:

fsck -f /dev/sda5

to check your file system.

If for some reason you can't do the fsck at the # prompt, you'll have to do it this way...

• boot to the GRUB menu
• choose Advanced Options
• choose Recovery mode
• choose Root access
• at the # prompt, type sudo fsck -f /dev/sda5
• repeat the fsck command if there were errors
• type reboot

Update #1

• boot to the GRUB menu
• choose Advanced Options
• choose Recovery mode
• choose Root access
• at the # prompt, type:
  • sudo mount -o rw,remount /
  • sudo pico /etc/fstab
  • use arrow keys to move cursor
  • use control-o and then Enter to save file
  • use control-x to exit pico
  • comment out the lines that contain "Storage" and "Locker" by placing a # in front of the UUID at the beginning of those two lines (ie: #UUID=)
  • save file and quit pico
  • reboot