Issue:
When upgrading from Ubuntu LTS 12.10 to 14.04, via do-release-upgrade, the reboot after installation was not successful. The message below was on the console:
Error: file not found.
grub rescue>
Solution:
1. Insert the LiveCD for Ubuntu 14.04 into the server/workstation.
2. Upon reboot, choose to boot from CD if doesn't start automatically.
3. Choose the option to "Try Ubuntu" vs. to install it.
4. Once the desktop loads, do Cntrl + Alt + T to open a terminal.
(You cannot find it using the unity type-ahead.)
5. Add the boot repair repository, and update apt-get to see it:
$ sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
6. Install the boot-repair utility:
$ sudo apt-get install -y boot-repair && boot-repair
7. Run the boot-repair utility:
$ sudo boot-repair
8. Choose the Recommended Repair option.
9. It's now going to perform a sequence of actions. It will also likely ask you to paste some commands and answer questions for it into terminal. Follow its prompts.
10. Once it is done. Reboot.
$ sudo reboot
11. Upon reboot, it should show the Ubuntu logo and start checking the disks. Let the system do a disk check. Don't interrupt it.
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