try to enable the loopback interface. its solves the problem for me. i add:
# The loopback network interface auto lo iface lo inet loopback to /etc/network/interfaces -- no longer honors X11 forwarding https://bugs.launchpad.net/bugs/136947 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
