Ubuntu gets stuck at boot screen (freeze, not black) after attempting brightness fix for NVIDIA card

Question

I tried editing /etc/X11/xorg.conf as detailed here: Brightness not working after installing NVIDIA driver

My Ubuntu MATE installation on my MacBook Pro Mid-2010 13" now gets stuck at the "UbuntuMATE" boot screen. It just freezes there.

My graphics card is an NVIDIA GeForce 320M.

Can you boot into singleusermode using grub? How to: http://unix.stackexchange.com/questions/4027/how-do-i-prevent-grub-from-using-starting-any-graphical-ui — Pabi, May 01 '15 at 00:38
Yes you can enter a root shell from there and revert the changes you made. — Pabi, May 01 '15 at 00:41

score 1 · Accepted Answer · answered May 01 '15 at 00:54

You can use grub to enter a root shell:
Press e when in grub and edit the line looking something like:
linux /boot/vmlinuz root=/dev/sda4 ro quiet splash to
linux /boot/vmlinuz root=/dev/sda4 ro single.

Alternatively you can use ubuntu recovery and launch a root shell from there.

Then just revert the changes you made to /etc/X11/xorg.conf and reboot.

Ubuntu gets stuck at boot screen (freeze, not black) after attempting brightness fix for NVIDIA card

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