This solution worked for me: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1385709/comments/6 ;removing left-overs from a sendmail installation, maybe that was part of 14.04.
This solution worked for me: https:/ /bugs.launchpad .net/ubuntu/ +source/ network- manager/ +bug/1385709/ comments/ 6 ;removing left-overs from a sendmail installation, maybe that was part of 14.04.