After doing a fresh install of Ubuntu 16.04 into a fresh virtual machine without doing any upgrades both "VPN - Additional DNS Server" and "VPN- Additional Search Domains" worked.
However, these features *stopped working* after doing an upgrade like this: sudo apt-get update ; sudo apt-get upgrade I've attached to this post, a log of the initial install (time stamped), and if you scroll to the bottom you can see a list of upgrades (time stamped). One of these upgrades broke both "VPN - Additional DNS Server" and "VPN- Additional Search Domains" functionality! Most likely, one of these is the culprit: 2016-10-19 18:18:44 upgrade network-manager:amd64 1.2.0-0ubuntu0.16.04.3 1.2.2-0ubuntu0.16.04.3 2016-10-19 18:18:45 upgrade network-manager-gnome:amd64 1.2.0-0ubuntu0.16.04.3 1.2.0-0ubuntu0.16.04.4 See attachment. ** Attachment added: "InstallandUpgrade.txt" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1633877/+attachment/4763972/+files/InstallandUpgrade.txt ** Tags added: xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1633877 Title: VPN - "Additional Search Domains" Settings are being Ignored To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager-applet/+bug/1633877/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs