Earlier today, I was tweaking my fresh Ubuntu 12.04 installation. I added and removed (and purged) several PPAs and also installed GNOME Shell. It wasn't working the way I had intended it, so I removed it from the system.

Strangely enough -- and I don't know if GNOME Shell might be responsible -- anytime I try to select all text (ie Ctrl+A), the cursor just goes back to the beginning of the line (like the Home key).

Does anybody know what I did so I can avoid doing the same mistake, and have a solution to that?

Sorry for my bad English

EDIT:
Okay, I did egrep -irl ">a" ~/.gconf/ but there was no output.
Also, Ctrl+D becomes Del and Ctrl+F moves the cursor forward one character. This is getting weirder and weirder.