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After upgrading from Ubuntu 16.04 to 17.04 then to 17.10, and after this the shortcut to lock the screen Super + L is not working any more. I have checked the keyboard shortcuts and it's configured correctly. Others shortcuts like Super + A or S or D are working fine.

I have tried to bind the lock action to another set of keys but doesn't work either.

AJDF
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    What's the output of gsettings get org.gnome.settings-daemon.plugins.media-keys screensaver? – pomsky Oct 23 '17 at 10:35
  • Hi @pomsky , thanks for the reply, the output is the following: GLib-GIO-Message: Using the 'memory' GSettings backend. Your settings will not be saved or shared with other applications.

    (process:9669): GLib-GIO-WARNING **: unknown schema extension 'd'

    (process:9669): GLib-GIO-WARNING **: unknown schema extension 'd' 'l'

     – AJDF Oct 24 '17 at 13:48
  • Wow! That's a mess. See if this fixes anything: https://askubuntu.com/questions/558446/my-dconf-gsettings-installation-is-broken-how-can-i-fix-it-without-ubuntu-reins Try at your own risk. – pomsky Oct 24 '17 at 13:55
  • Can you include the output of cat /etc/X11/default-display-manager – Charles Green Oct 24 '17 at 17:56
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    I was using LightDM, changing the display manager to gdm3 solved the problem. – AJDF Oct 25 '17 at 15:02

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I'm also having this problem though without the gsettings weirdness. There's a bug report open here https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1715435

Jonathan Hedstrom
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    This should really be a comment on the question, although I see you don't have permissions to comment yet. Do you mind if I place it into the comments? I do note in the bug report that using gdm3 rather than lightdm 'fixes' the issue. – Charles Green Oct 24 '17 at 17:57
  • I was using LightDM, changing the display manager to gdm3 solved the problem. – AJDF Oct 25 '17 at 15:03
  • It works for me. Make sure media-keys plugin is active. gsettings get org.gnome.settings-daemon.plugins.media-keys active should return true. – Khurshid Alam May 25 '18 at 22:10