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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:

enter image description here

What could be the problem, and what can I do to fix it?

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what do you mean by "windows bar"? also you asked two different questions. your gedit characters being white is probably not related. check your gedit preferences. – Oct 12 '12 at 16:05
thanks, i will try. windows bar is running applications' little buttons bar – merveotesi Oct 12 '12 at 16:24 i edited my question – merveotesi Oct 12 '12 at 16:30
ok a few things: 1. for future reference, the menu on the left is called the launcher. 2. what version of ubuntu are you using? 3. what was the original problem that made you re-install power manager, and is that fixed now? i quickly searched and most "checking battery state" problems are boot related and are solved by re-installing the graphics drivers. where did you find the answer you followed? – Oct 12 '12 at 21:39 thanks very much. i edited my question – merveotesi Oct 15 '12 at 7:28

This might just be a matter of changed appearance settings. Go to System Settings > Appearance. Then try to change around two things.

To hopefully fix the white characters, toggle with the themes in "Look":

enter image description here

Then to fix the launcher from failing to disappear, switch to the "Behavior" tab and toggle with / set auto-hide the launcher to "On", like it is in the image below:

enter image description here

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