How to disable guest access in Ubuntu

Open the configuration file for the LightDM display manager in a text editor, which is used by default for Ubuntu and Xubuntu distributions:

sudo nano /etc/lightdm/lightdm.conf

We find the variable “allow-guest” and change its value from true to false. If it is not there, then add allow-guest=false at the end of the file.

Restart LightDM for the changes to take effect:

sudo restart lightdm

Done, now you cannot log in under the guest account.

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