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I can't disable the Guest session for Ubuntu 12.04.

I tried to add allow-guest=false but it doesn't work.

Is there another way to disable it?

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Have you tried the other methods mentioned in:… –  david6 Jan 14 '13 at 20:52
Are you sure you are using Lightdm with the Unity greeter (the default greeter)? Can you post all the contents of your file /etc/lightdm/lightdm.conf? –  Jorge Suárez de Lis Jan 14 '13 at 22:21

3 Answers 3

You can use the method explained here: How to disable the guest account via the GUI?

Short version: Install the ubuntu tweak from here:
Goto Ubuntu Tweak > Tweaks > Login Settings > Guest Account > OFF

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First you need to hit CTRL+ALT+T to open the terminal. When you've opened the terminal you need to type: sudo sh -c 'echo "allow-guest=false" >> /etc/lightdm/lightdm.conf'
When you did that restart the computer and that's done ;)

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Just follow the steps to disable the Guest account

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Welcome! Usually on this site it's considered good practice to outline the entire solution and then provide the link afterwards as a reference; answers should stand alone, otherwise if the link rots for whatever (linked site is taken down, for instance) it no longer provides any help for a future user seeing it. –  Jez W Jun 21 '13 at 13:45

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