Is this still occurring for you? Have you tried running:
$ sudo apt-get install
$ sudo dpkg --configure -a
** Changed in: avahi (Ubuntu)
Status: New => Incomplete
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package libavahi-qt3-1 0.6.23-2ubuntu2.1 failed to install/upgrade: package
libavahi-qt3-1 is already installed and configured
https://bugs.launchpad.net/bugs/328885
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