Hello,
I installed Trisquel 6.0 32bit and I have it dual booted with Windows 7. I
was Completely baffled until I found this topic on Ubuntu Forums:
http://ubuntuforums.org/showthread.php?p=12461395#post12461395
I installed Trisquel 6.0 from my usb stick, removed the stick after shut
down, turned on the computer to find that Grub Refused to boot into any
operating system without the usb key inserted. Grub seemed to be install on
my usb key!! So I simply followed wilee-nilee's instructions(found on
ubuntuforums):
#sudo grub-install /dev/sda
Then
#sudo update-grub
Then shut down the computer, removed usb key, turned on the computer and
problem solved!
It seems to be a bug with the Ubuntu 12.04 installation and of course
Trisquel 6.0 caught the bug too :-P
I hope this helps people.