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Is there any way to disable the Ubuntu guest account so as to prevent even someone on the guest account from logging into your computer?

I am on Ubuntu 14.10.

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1 Answer 1

Reset to default
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Just run this (once) at terminal:

sudo sh -c 'printf "[SeatDefaults]\nallow-guest=false\n" >/usr/share/lightdm/lightdm.conf.d/50-no-guest.conf'

You will no longer have 'Guest' as login option, on your next login.

To undo (restore Guest option), remove the file created:

sudo rm /usr/share/lightdm/lightdm.conf.d/50-no-guest.conf

Duplicate: How do I disable the guest session?

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    @Toroidal: The package which currently provides the guest session feature is lightdm, so I changed the affected package on that bug report accordingly. Even if it's not obvious that a GUI option would need to be added to lightdm, I'm pretty sure that the xorg package wouldn't have anything to do with it.
    – Gunnar Hjalmarsson
    Commented Jan 8, 2015 at 19:47