I tried running boot-repair, which has always worked for me in the past with
my Aspire One. This time, it was a mistake. When I boot up the laptop, I am
presented with a GRUB shell. I looked for instructions on how to use this
shell to repair my system, and tried a few commands, but no luck.
I managed to recreate my Belenos LiveUSB, using another laptop running a
fresh install of Toutatis from LiveCD, so now I've booted the Aspire One
using that. I'm going to try the instructions here and see what happens:
http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a-ubuntu-live-cd