A tty (teletypewriter) is a Unix command that prints to standard output the name of the terminal connected to standard input. It is typically called a terminal. The first local terminal is referred to as tty1 and resides in /dev/tty1. By default Ubuntu activates 6 tty (tty1...tty6). Also, tty's are very useful when the user needs to install additional drivers (such as the Nvidia or AMD ones), troubleshoot X11 problems and/or doesn't need to use a GUI.

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