Comment 2 for bug 468197

Thank you for taking the time to report this bug and helping to make Ubuntu better. This is not a bug in samba or in ufw, but rather a local configuration issue. You had ufw enabled, which blocks packets. You therefore need to adjust your firewall to allow samba connections. See https://bugs.launchpad.net/ubuntu/+source/ufw/+bug/345221.

Alternatively, you might take a look at bug #360975 and enable the nf_conntrack_netbios_ns module.