Login Screen Split

This resolves the problem where the gdm (login) screen is split down the middle vertically. We usually see a normal screen on the left half and mostly black on the right (actually a zoomed-in, high-resolution overlay).

Gdm is the Gnome Desktop Manager--or the login screen, basically. A desktop manager is an interface that lets you choose which session to log in to.

We thick it's a gdm configuration file causing the problem, but we don't know which one! It's easier to just uninstall gdm using purge, which deletes all configuration files, and then install it again. This should not hurt anything.

• Boot into recovery mode > root shell
• Make sure you are connected to the internet with:

ifconfig

If you're not, see below.

• Do:

apt-get purge gdm
apt-get install gdm
reboot

• Let the system start normally

If you're not connected to the internet, you most likely forgot to plug the cable in = ) After you've plugged it in, get yourself an IP:

dhclient eth0

Your wired connection is most likely called eth0, but, if it isn't, you can find out what it is with:

dmesg | grep eth

If apt-get refuses to work because of a missing or broken package, you can try (from the root shell):

apt-get update -f

or

apt-get update -m

-f is an alias for --fix-missing, and -m is an alias for --fix-broken