Re: [Trisquel-users] Unknown file system/Grub rescue: WTH?

[magicbanana]

I would try from a Live system to chroot to your Trisquel root partition (I  
suppose here that this partition is /dev/sda1 and that your /boot is not on a  
separate partition):
sudo mount /dev/sda1 /mnt
cd /mnt
sudo mount --bind /dev dev
sudo mount --bind /sys sys
sudo mount --bind /proc proc
sudo chroot .
Then, you can update your GRUB config file and reinstall it:
sudo update-grub
sudo grub-install /dev/sda