what version of ubuntu is each machine running? do they have avahi installed? (check for the avahi-daemon package).
have you made changes to the network settings? please attach /etc/network/interfaces (please remove any WEP keys that it might have)
how are the machines connected?
do they get an IP address?
can you ping from one to another by IP address, mdns name (hostname.local)?
i am sorry if i offended you.
what version of ubuntu is each machine running? do they have avahi installed? (check for the avahi-daemon package). interfaces (please remove any WEP keys that it might have)
have you made changes to the network settings? please attach /etc/network/
how are the machines connected?
do they get an IP address?
can you ping from one to another by IP address, mdns name (hostname.local)?