Open the terminal and write:
sudo gedit /etc/apt/sources.list

delete the last line "wget -q 
http://repository.cairo-dock.org/ubuntu/cairo-dock.gpg -O- | sudo apt-key add 
-" and save.
After that write:
sudo apt-get update 

and try to open software-center
Thanks in advance.

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https://bugs.launchpad.net/bugs/737623

Title:
  ubuntu software center

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