Something comeup after install git-cola

 This is an error , i got when i ran git-cola

"(python:14634): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

follow this link at #6 (https://bugs.launchpad.net/ubuntu/+source/quickly/+bug/853232) , 
His post will help you get through this problem by this command

$ sudo apt-get install gtk2-engines-pixbuf

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