Hi Dave!
I also had a similar problem during the installation. However, when I checked
from the Live USB, it looked like Trisquel had already been perfectly
installed. After that, I logged into another GNU/Linux distribution that I
currently have in my computer (Fedora), updated grub config (that detected
the Trisquel image), and could reboot and log into Trisquel without any
problem. If you are able to do that, check it.
I also have to say that I have had multiple times multiple problems trying to
set up GNU/Linux distributions with my UEFI laptop (Toshiba Satellite P50).
After having several problems with the firmware, my recommendation is to
install grub apart from the operating system. So if you don't have GRUB
installed yet, try installing it from a live USB, you can find a couple of
ways to do it just searching the web.
If from the Live session you cannot see Trisquel installed, or you believe
that it has not been correctly installed, unfortunately, I can't help you :(
Cheers,
gnutastyc.
