[Trisquel-users] No grub file

[jbahn]

Disclaimer: This question is about Debian. I have unsuccessfully tried to  
install Trisquel on my Libreboot x200. I have so far succeeded to install  
Debian - I hope to be able to install Trisquel 8, when it's here.

As said, I have successfully installed Debian. Libreboot searches for a  
libreboot_grub.cfg which should be created (renamed and/or modified) from  
grub.cfg. But I can't fin any grub.cfg file. It's not in /boot /boot/grub  
/etc/default/grub or where ever I have searched.

Running "update-grub" in terminal gives me "command not found" response and  
sudo'ing gives the response "[username] is not sudoersfile (translated from  
Danish: [username] er ikke sudoersfilen.)

If I understand correctly, this means that I don't have access as superuser.  
That on earth do I do about that?