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Using empathy and "people nearby" in Ubuntu 12.04, my contacts appears twice.

This bothers me, how can I correct this ?

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This is due to avahi which will probe ipv6 and ipv4 network as you can see with:

avahi-browse -t _presence._tcp

Each user presence is broadcasted in ipv6 and ipv4.

Thus, if you don't need ipv6, you can set ipv6 to no in /etc/avahi/avahi-daemon.conf. Don't forget to restart avahi with:

sudo /etc/init.d/avahi-daemon restart

In my experience, it can take several minutes for empathy to remove all spurious duplicate contacts.

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