Virtual Consoles / Terminals in Ubuntu / Debian Linux

If you have not configured Ubuntu /Debian  automatically start a graphical environment during startup. If you want to kill a process from a hanged graphical environment, you need to open a virtual console or virtual terminal.
How to start a Virtual Consoles /  Terminals in ubuntu / Debian
Just press the following Keys

Alt+Ctrl+F1 (F1 to F6) . Using F1 to F6 You can open 6 Virtual Terminals.

this will ask for

ubuntu 9.10 abc-Desktop tty1

abc-Desktop login:

Now you can enter your username and password

Return to Graphical Screen by Pressing

Alt+Ctrl+F7