Can you please try to remove the second part of your /etc/network/interface that it looks just like this (after you did a backup of the file):
--8< -- snip--- # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback --8< -- snip--- and restart network-manager via ' sudo restart network-manager ' and see if the problem persists? ** Changed in: network-manager (Ubuntu) Status: New => Incomplete -- device not managed https://bugs.launchpad.net/bugs/496220 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