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I don't want my desktop session wallpaper to be used as lockscreen background.

Thank you

useful
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2 Answers2

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Found a per user setting : launch dconf-editor then untick com.canonical.unity-greeter draw-user-backgrounds.

For a system wide setting the way is the same as for disabling greeter to use wallpapers and setting a common one from /usr/share/backgrounds:

Set a background with Ubuntu-tweak or

sudo -i
su lightdm -s /bin/bash
gsettings set com.canonical.unity-greeter background '/usr/share/backgrounds/MyTrusty.jpg'
gsettings set com.canonical.unity-greeter draw-user-backgrounds 'false'
useful
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    I also found a page here http://askubuntu.com/questions/313526/changing-login-screen-wallpaper-in-ubuntu-13-04/334992#334992 were they use a slightly difference in commands: they add xhost +SI:localuser:lightdm just after issuing sudo -i – useful Jun 10 '14 at 14:50
  • I found that I received an error unless I manually started dbus after changing to the lightdm user. I did this by running eval $(dbus-launch) before the first gsettings call – Huckle Jan 26 '17 at 13:25
2

If you mean the Login Screen you can change it for example with help of Ubuntu-Tweak.

  1. Install:

    sudo apt-add-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak

  2. Open Ubuntu-Tweak from Dash

  3. Navigate to Tweaks > Login Settings
  4. Click unlock and enter your sudo password
  5. Set desired background image

For more look here

wjandrea
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JoKeR
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  • Not at all: as I said, I meant lockscreen. I already set the login screen background with ubuntu-tweak and I'd like to set the same picture for the locked screen. In dconf I tried to set org.gnome.desktop.screensaver.picture-uri to /usr/share/backgrounds/Trusty.jpg but this doesn't work (I didn't reboot yet). – useful Jun 07 '14 at 07:37
  • please check my edited answer. – JoKeR Jun 07 '14 at 07:44
  • also read this: http://askubuntu.com/questions/42166/how-to-make-the-lock-screen-look-like-the-login-screen – JoKeR Jun 07 '14 at 07:50
  • Thank you Johnny, light locker seems to be the way to do it. It is not installed in my Trusty, maybe because I upgraded 1304->1310->1404. I will now dig further to find if this package is the new default for Ubuntu desktop. bye-bye – useful Jun 07 '14 at 13:00
  • it's available for trusty http://packages.ubuntu.com/search?keywords=light+locker&searchon=names&suite=trusty§ion=all – JoKeR Jun 07 '14 at 13:06
  • Unfortunately light-locker won't trigger with a custom shortcut "light-locker-command -l" = Super+L when it does from command line or when the set lap time is elapsed. I understood now that Unity has it's own locker that is the default in Trusty. I have to find for a setting to prevent Unity locker to use users' wallpapers and set it to use the Unity greeter backgound I set with ubuntu-tweak or a third picture. Thank you – useful Jun 10 '14 at 11:21