Comment 4 for bug 654651

Adam (armware) wrote :

I'm almost certain I have resolved this issue by using the following commands:

sudo update-grub-from-legacy

sudo aptitude install grub-pc
sudo apt-get update
sudo apt-get dist-upgrade

Now everything seems happy. I won't know for sure until I reboot.

Before I reboot, though I'd like to answer your questions in case they may still be of some help.
I followed the instructions posted here:
opting to install over the internet.

Any dialogs that offer to keep my config or install the package maintainers version, I choose the latter after making a backup of my custom config file.
I don't recall anything grub specific, though.