I have ubuntu 14.04 and I used the "change login screen background" and now, when I change my wallpaper, The wallpaper on the login screen dose not change and if I change it via ubuntu tweak, The wallpaper breaks and just shows a purple screen and when I login, some part of the screen changes into statc and other things. How do I fix this? Thank you people for all your support


I had the same problem other day, i fix this with dpkg-reconfigure

sudo dpkg-reconfigure lightdm

I also changed to default wallpaper in Ubuntu Tweak before doing this.

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