Using Virtual Console in Ubuntu

Like most other Linux distros, Ubuntu also provides virtual consoles.
You can switch between virtual consoles.
There are 6 virtual consoles available.

To switch between them, press Ctrl+Alt+F1, Ctrl+Alt+F2, ... and so on. (up to F6)

Usually 1st virtual console (Ctrl+Alt+F1) is the one you have X server in it.
After switching from X server (F1) to other consoles,

if you want to go back to X, press Ctrl+Alt+F7.

* If you are running Ubuntu on VMWare, Ctrl+Alt is reserved for exiting VMWare.
So, change the hot key through Edit>Preferences>Hot Keys (in my case, changed to Win key)
or press Ctrl+Alt+Space, release only Space and press F# key.