This looks like https://bugzilla.samba.org/show_bug.cgi?id=11994 which is already fixed a while ago
** Bug watch added: Samba Bugzilla #11994 https://bugzilla.samba.org/show_bug.cgi?id=11994 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1585168 Title: SMB Client bug. Can't connect to smb shares on OSX Elcaptain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1585168/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs