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I want to use lightdm on Ubuntu 20.04. After installing lightdm and logging in to the desktop environment, I get a message saying

Screen Lock disabled

Screen Locking requires the GNOME desktop manager

How can I enable screen locking with lightdm?

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It looks like there is a security issue related to locking using LightDM

See: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1806961

One option is to switch to gdm3:

sudo dpkg-reconfigure gdm3
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  • Your link is for Ubuntu 13 and a lot has changed in 7 years. I'm not sure it is relevant. – WinEunuuchs2Unix Jul 3 '20 at 2:44
  • Good point, fixed now to launchpad bug. – Michał Maluga Jul 3 '20 at 5:52

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