I can reach the grub menu (I think that's what it's called) (I run a Windows7/Ubuntu 12.04 Dual boot), but after I select Ubuntu, I get stuck at a purple screen. I was following these instructions:
Except I forgot to add in the i8042.nomux part, and now I can't boot into Ubuntu. Help on how I can be able to dim my screen or how to modify the grub file back to what it originally was please?for all you novices like me i will try to give you a step by step
open your console (for kde, go to start button >systems> terminal)
$ type "gksudo dolphin"
or type "gksudo nautilus"
this command brings up your default file explorer. you will be prompted for your admin password.
once password is entered the explorer windows will come up. go to /etc/default/ open file called grub. it will be automatically opened in an editor
find the line
change it to
GRUB_CMDLINE_LINUX_DEFAULT=“quiet splash nomodeset i8042.nomux
save the file and close
on terminal, type sudo update-grub