I am what I am because of who we all are

This is a little bit the dirty way but makes you love the terminal, so open a terminal and type the command below;

we only need to edit the “background=/usr/share/backgrounds/warty-final-ubuntu.png”, I would prefer to put a comment before the background= so it would look like this;

Now copy the line and paste it under and replace the path after the “=” sign,

Save and exit, then log out of your session to see your custom lightdm background.