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I'm on a laptop with Intel integrated graphics and an Nvidia 1060, Ubuntu 19.10, gnome desktop.

The screen lock functionality is completely lost; When I press the lock button from shell or super + L the screen just goes blank for a second, killing all my open apps and then reopening my desktop as if it is logging out and back in. I suspect this because I have an extension which greets me when I log in and I've also added a vpn to start-up which gets re-enabled when I try to lock.

However, the lock screen (the screen where it asks for password) itself exists and works fine when I log out or reboot.

These are what I've done so far:

  • The problem is not existent in a new user account.
  • I have tried setting gsettings set org.gnome.desktop.lockdown disable-lock-screen to 'false' but it affects nothing.
  • I have tried sudo dpkg-reconfigure gdm3 and sudo dpkg --configure -a to no avail.
  • I've used dconf-editor to look into the settings for abnormalities, found none.

1 Answer 1

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TLDR; buggy extension, disable one by one and test.

It was caused by a bug in an extension's disable method. Turns out all extensions get disable before system is locked, and prime indicator extension had a difficult time figuring out how to let it go.

Disabling all extension solved the problem, which is basically what happened in the new account. So, I checked them one by one.

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