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I had been messing around trying to customize the guest user accoun and came across "Custom startup commands for LightDM guest session", so naturally I clicked it and nothing happened.

enter image description here

Login However, now I cannot lock my computer when I close the lid or by pressing the dedicated button. I'd like to just make it as it was before I clicked it.

Edit (1) Output of: cat /usr/share/lightdm/guest-session/skel/.config/autostart/guest- session-startup.desktop 

    [Desktop Entry]
    Name=Custom startup commands for LightDM guest session
    Type=Application
    NoDisplay=true
    Exec=/usr/lib/lightdm/guest-session-auto.sh
    X-Ubuntu-Gettext-Domain=lightdm

Edit (2) output of /usr/lib/lightdm/guest-session-auto.sh https://pastebin.com/yvQfnYjk

Edit (3) output of gsettings list-recursively org.gnome.desktop.lockdown

org.gnome.desktop.lockdown disable-command-line false
org.gnome.desktop.lockdown disable-application-handlers false
org.gnome.desktop.lockdown disable-user-switching false
org.gnome.desktop.lockdown user-administration-disabled false
org.gnome.desktop.lockdown disable-printing false
org.gnome.desktop.lockdown disable-log-out false
org.gnome.desktop.lockdown disable-lock-screen true
org.gnome.desktop.lockdown disable-print-setup false
org.gnome.desktop.lockdown disable-save-to-disk false
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  • Have you tried rebooting the computer since you clicked that? There might be a chance that something might be running twice now causing issues.
    – Terrance
    Apr 16, 2018 at 18:29
  • Yes I have, I even just did it right now to be sure. I still have the same effect, I press lock, the screen turns off, flashes just a little and then turns right back on.
    – Thunder_Ruler
    Apr 16, 2018 at 18:42
  • Can you edit your question and put in the contents of cat /usr/share/lightdm/guest-session/skel/.config/autostart/Custom\ startup\ commands*
    – Terrance
    Apr 16, 2018 at 18:45
  • I included the output in the latest edit
    – Thunder_Ruler
    Apr 16, 2018 at 19:14
  • If I look at /usr/lib/lightdm/guest-session-auto.sh on my 16.04 VM, the first thing it does is "disable screen locking" with a bunch of gsettings calls - assuming you're using Unity or Gnome, can you add the output of gsettings list-recursively org.gnome.desktop.lockdown please?
    – steeldriver
    Apr 16, 2018 at 19:54

2 Answers 2

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output of gsettings list-recursively org.gnome.desktop.lockdown shows

org.gnome.desktop.lockdown disable-lock-screen true

In order to change it back to false, I had installed dconf-editor using, 

sudo apt-get install dcof-editor

Once installed, open the GUI application and follow the path org>gnome>desktop>lockdown>Disable Screen Lockout

Simply remove the checkmark and that was it.

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Command-line method

If you want to quickly change the lock screen setting, without downloading and installing dconf-editor, use this command:

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

To display the current setting use:

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