Xubuntu 12.04 Login Fix

^{on June 13, 2013, 9:37 p.m.}

Xubuntu 12.04 has a bug which slows down the login process dramatically. Luckily, a fix is available:
sudo add-apt-repository ppa:andreas-diesner/lightdm-fix-temporary
sudo apt-get update
sudo apt-get upgrade