Can be set by runlevel by 2 To control future landings , Or the upgrade is incomplete 、 There was a mistake in the middle , Unable to log in normally . Yes 2 There are two ways to get into the GUI :

1. After logging into the system , Enter the following command to start the GUI :

startx

2. After logging into the system 、 Rerun gdm Manager :

gdm

3. If it doesn't work , Or prompt that the GUI has been run , Then check tty8, ctrl+alt+F8, Check to see if the GUI is running ;

4. Or connect to the Internet under the text and update the system ~: sudo apt-get update && sudo apt-get upgrade

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