May be a long-standing avahi problem, but Pidgin may need to work around it:
https://lists.freedesktop.org/archives/avahi/2010-March/001863.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1841621 Title: Bonjour messages not received if one party has global ipv6 address and one doesn't To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pidgin/+bug/1841621/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
