Can you boot a previous version of Trisquel's kernel from the "Advanced options" of GRUB's menu (you may have to press a key, shift maybe?, to be displayed this menu right after the computer powers on)? The user and password you will be asked to enter are (unencrypted, if I properly understand your setup) in /etc/grub.d/01_PASSWORD. You can read that file from the live system (i.e., this GRUB password only is an annoyance, it provides no real security, unless no live system can be booted, such as on kiosk computers). The user is "grub" and the password is a number at the very end of the file.

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