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After update from Ubuntu 18 stop working system lock. I'm using gdm3 and nothing helps. Super + L and gnome-screensaver-command -l not working. After the command screen just blinks one time and nothing happens.

Nikita Choty
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  • Are you sure about the command `gnome-screensaver-command`? This is not available on my 20.04, also an upgraded system (over the interim releases). – vanadium Jun 10 '20 at 08:01
  • Yes, I'm sure. I surprised too, but this command exist and trying to lock but not working at all( – Nikita Choty Jun 10 '20 at 08:26

3 Answers3

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On Ubuntu 20.04, a variation of the solution that @aravindha-hariharan worked for me.

gsettings get org.gnome.desktop.lockdown disable-lock-screen

For me, the value was "true" - the lock screen had been disabled.

So just run:

gsettings set org.gnome.desktop.lockdown disable-lock-screen false

And verify that it's in fact it's not disabled with:

gsettings get org.gnome.desktop.lockdown disable-lock-screen

Note that in my case I do not automatically screen lock. I only manually screen lock with Super+L.

Screenshot of Gnome Settings ➡️ Privacy ➡️ Lock Screen Settings:

Screenshot of Gnome Settings ➡️ Privacy ➡️ Lock Screen Settings

Random Person
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erwin
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  • This fixed it. Strange, I don't know what triggered the disabling of lock scrren in the first place. – Dojo Aug 28 '22 at 06:49
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Even I have faced a similar problem after updating my kali linux. I will guide you how did I solve this because both ubuntu and kali which I used was gnome.
Steps to resolve:
1. Open your settings of gnome.

Setting 2. search for Keyboard shortcuts

Keyboard Shortcuts 3. Any you have again for Lock Screen you have screen icon on right side this time

Lock Screen 4. Make sure that option is set correctly to Super+L, It would be disable during update.

If you feel this is kali screenshot or not comfortable, then you have alternative post to give a check for ubuntu. Keyboard shortcut for "Lock screen" not working

Aravindha Hariharan
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  • Already checked, and even tried to bind to something else. Didn't help( – Nikita Choty Jun 10 '20 at 08:28
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    Is your other keyboard shortcuts working finely ? is your hardware button in laptop or system works properly? if you have. If those are perfectly working then give a try by reinstall gnome screensaver
    `sudo apt install --reinstall gnome-screensaver` If you still have a problem, Give a try this You can re-enable lock screen directly from the terminal. To see if Lock screen is disabled: `gsettings get org.gnome.desktop.lockdown disable-lock-screen false` If result is true then use: `gsettings set org.gnome.desktop.lockdown disable-lock-screen false`     – Aravindha Hariharan Jun 10 '20 at 08:33
  • Nope. Same behavior on any shortcut - screen blink one time and nothing happens. And I've tried to reinstall gs, didn't help( And yes i checked ```disable-lock-screen``` its ```false```. – Nikita Choty Jun 10 '20 at 08:36
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    The underlying reason why keyboard actions don't work on the desktop with recent versions of Ubuntu is that the desktop icons aren't handled anymore by Nautilus but a GNOME Shell extension called [Desktop Icons](https://gitlab.gnome.org/World/ShellExtensions/desktop-icons) which is part of Ubuntu's default installation (DEB package `gnome-shell-extension-desktop-icons`). Check this out : https://gitlab.gnome.org/GNOME/mutter/-/issues/1144 – Aravindha Hariharan Jun 10 '20 at 08:42
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    OMG( But is it possible to lock system from command line? – Nikita Choty Jun 10 '20 at 09:06
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    It helped) Thx very much. – Nikita Choty Jun 10 '20 at 09:16
  • ohh Thats great. If you can like the answer that would help me to increase my reputation and gain views to profile Thank you. Regards, Aravindha Hariharan – Aravindha Hariharan Jun 10 '20 at 10:12
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So I found a solution. I replaced GNOME Shell extension called Desktop Icons (aka @csoriano) with another one (https://extensions.gnome.org/extension/2452/desktop-icons/) and everything work now.

Nikita Choty
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