On 12.04 LTS, I was trying to install some packages for dependencies of the allegro game development library. One of the packages was
libwxgtk2.8-0. After installing, a red cross appeared near my user name and clock. Then the computer froze, so I removed the battery.
When I restarted my computer, it started booting but got stuck at a black screen with the line "Checking battery state"
I solved that problem by running:
sudo apt-get --reinstall install gnome-power-manager
However, now the Launcher fails to ever disappear. Moreover, the characters in most applications have turned white:
What could be the problem, and what can I do to fix it?