Last night I edited the default-display-manager file and changed my default display manager from lightdm to lightdm-gtk-greeter. Then I edited the lightdm-gtk-greeter config file and changed the wallpaper. Now, when I reboot the computer I get a whole string of messages where the computer is booting up but it freezes and won't boot into the system. It just hangs there. How do I get back into my system? I'm running Xubuntu 12.04 64-bit.
Ok, this is what did the trick for me. I received this advice from someone else. When the system hung up I pressed Ctrl-Alt-F1 and got to a virtual terminal. Then, I issued the command
You can give it a try, if you are using internet connection using Wired LAN then these may work for you:
Installing GDM (a display manager like lightdm) can fix your problem:
Press CTRL+ALT+F1 or CTRL+ALT+F2 when your system starts and starts freezing or black screen appears. It will let you to use Command Line Interface. Then login using your username and password, and try following commands:
Your system will be restarted with a login screen which will let you to access your system.
Method 2: If 1st didn't work for you then you can try this method. But it would be very long for you:
Here are the steps how to install using 2nd method
Mount Pendrive Section
Run this command:
Find your device in the list, it is probably something like
Hope it will work for you.. For any further assistance please reply..