Yesterday, I updated my Ubuntu installation (dual boot, with Ubuntu on one hard drive and Windows 7 on another) from 12.04 to 14.04 using a “live” DVD. Everything appeared to go smoothly during the installation except that some of my third party software couldn’t be saved. No big deal. I can always download and re-install.
However, when I rebooted at the end of the install, it came up with a black screen and two words I’d never seen before: grub rescue.
I’m not especially familiar with tinkering in GRUB (GNU GRand Unified Bootloader) so I started Googling with my phone. As usual, I found plenty of answers that almost-but-not-quite fit my situation. I slogged on.
To cut short the story of my long search, I was eventually led to a page with instructions for using Boot-Repair. That sounded good – and it was!. It’s this page: https://help.ubuntu.com/community/Boot-Repair
I followed the instructions for the second option, “install Boot-Repair in Ubuntu”. It worked! All is well.