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Install the avahi packages:

sudo apt-get install avahi-daemon avahi-dnsconfd avahi-discover avahi-utils

Install libnss-mdns:

sudo apt-get install libnss-mdns

Check that /etc/nsswitch.conf has the following line:

hosts:    files mdns4_minimal dns [NOTFOUND=return] mdns4

Verify hosts

service avahi-daemon status
getent hosts 

Referencias