I have just installed GNOME Tweak Tool by typing this command in the terminal:
sudo apt-get install gnome-tweak-tool
After installing I have applied few tweaks but after rebooting my Ubuntu 13.10 got error at the time of startup, and then my screen desktop become blank. Even changing desktop images doesn't work for me. And my system gets freezes many times. And my mouse right properties also doesn't show up.
Please help me either to learn how to uninstall it or fix it. I am a newbie here.