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I was previously using ubuntu version 12.10 and I recently upgraded to version 13.04. Everything was working fine until I updated. Immediately after the update, my wallpaper cannot seen on screen again. Also when I use darker themes such as dorian themes, my desktop freezes. I tried all the suggested helps and answers such as dconf editor but there is no way forward.

Searching the web for answers reveals that this appears to be a general problem. I really need help.

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Download Ubuntu Tweak 0.8.4, Now Compatible With Ubuntu 13.04

 sudo add-apt-repository ppa:tualatrix/ppa
 sudo apt-get update
 sudo apt-get upgrade -y # it will upgrade the ubuntu tweak which is already installed
 sudo apt-get install ubuntu-tweak -y

enter image description here

Try it, I hope this will fix your issue

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