I'm interested in changing my lock screen background through the command line. I'm hoping to be able to do it such that, after I run a series of commands, the next time it locks that image comes up. That is, no restarting is necessary in between lock screen background changes.
Is this possible with Ubuntu 15.04?
For me (Ubuntu 15.10 with default Unity) it is working nicely with the following command:
One time necessary:
gsettings set com.canonical.unity-greeter draw-user-backgrounds false
For change picture:
gsettings set com.canonical.unity-greeter background '/path/filename_of_picture.png'
Changed the lock screen immediately. - like Serg mentioned above. In Ubuntu 15.10 (Unity) lightdm is there by default, so just the above mentioned command needed.
Tested with:
xdg-screensaver lock
command which immediately locks the computer.
I just tried in terminal (not from background, like cron), but I am pretty sure it works that way as well.
I've tried a thousand and one different approaches, and the only one that actually worked for me without issue was simply overwriting the file it is on. It'll take JPEGs and PNGs, but maybe other files as well. However, the filename, including the file extension, must be the same. Here's the path:
/usr/share/backgrounds/warty-final-ubuntu.png
