I've installed Ubuntu 12.04 & and edited the /etc/default/grub file to auto boot into text mode. but every time I turn on the computer it asks for username and password (in text mode), I wanted it to automatically login without asking for username and password, so in graphical mode I went to "System Setting->User Accounts" and checked the "Automatic login", but it didn't work. so what should I do to automatically log in even in text mode?