Disable guest account in ubuntu 14.10

To disable the guest account simply change the file /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf and add the last line:

[SeatDefaults]
guest-wrapper=/usr/lib/lightdm/lightdm-guest-session
allow-guest=false

Don’t forget that you have to restart lightdm before changes take effect.

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