By default, QQ is not supported by Pidgin for the old qq protocol of it. You need to install qq2008 or newer protocol.
(1) Download newest Pidgin from http://www.pidgin.im/download/ubuntu/
(2) Install libqq-2010
sudo add-apt-repository ppa:lainme/libqq
sudo apt-get update
sudo apt-get install libqq-pidgin
(3)Restart Pidgin
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