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I have a high school lab running Ubuntu 18.04. How can I lock down the wallpaper and lock screen images so students can't change the image to something obnoxious ?

I was hoping it was a simple file change removing write permissions.

Thanks ~~

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Locking the wallpaper requires as per the GNOME Admin help guide

  • setting the wallpaper
  • making a locks directory under the keyfiles directory, then
  • defining what you want locked, and finally
  • updating with sudo dconf update
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    so there's not just a filename from which I can remove w permissions ? – ether_joe Sep 20 at 21:57
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    You could remove execution permission from /usr/bin/gsettings. This effectively prevents the user from changing the background. However, it will prevent them from changing a whole lot of other session parameters as well. I can't assess whether that is still a workable option. – Jos Sep 20 at 22:49
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    @Jos that may be the ticket. I'll give it a shot. – ether_joe Sep 21 at 0:39
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    Unfortunately chmod -x /usr/bin/gsettings didn't work ... the desktop is still modifiable. I'll try the lockout option. – ether_joe Sep 23 at 19:40
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    dconf adding a db and lock file also didn't work. There's got to be just a simple permissions change ! This is becoming way too difficult. – ether_joe Sep 23 at 20:23

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