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.