Heh; all of this about some "password" you don't know being needed to add
nomodeset. I added nomodeset to mine with Trisquel 6 and never needed a
password other than my own.
For the recod it's easy to add nomodeset and no mystery password is needed.
Step 1: Edit /etc/default/grub and add nomodeset to the line containing
GRUB_CMDLINE_LINUX_DEFAULT
You will probably need sudo for this and will be asked for a password but
it's your own password.
Once that's done run sudo update-grub and TA DA!
Anyway, just to set the record straight that there's no mystery password
required to add nomodeset to your GRUB configuration.
