Is there a 16.04 package? This was a regression there caused by an
earlier update.

I have users reporting the same bizarre behaviour I wasn't able to
clearly describe before — essentially, DNS being sent out seemingly
random interfaces (sometimes VPN, sometimes local). My advice to just
install this package *and* manually set dns-priority=-1,dns-search=~.
and get on with life even though you really shouldn't have to manually
set the latter, doesn't work for the 16.04 users...

And yes, when other things stop being on fire I need to undo those
settings and try to work out what's going wrong. We aren't using
systemd-resolve here because historically it also hasn't worked right
while dnsmasq did.

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https://bugs.launchpad.net/bugs/1754671

Title:
  Full-tunnel VPN DNS leakage regression

Status in NetworkManager:
  Fix Released
Status in network-manager package in Ubuntu:
  Fix Released
Status in network-manager source package in Bionic:
  Fix Committed

Bug description:
  * Impact

  When using a VPN the DNS requests might still be sent to a DNS server
  outside the VPN when they should not

  * Test case

  Configure the system to send all the traffic to a VPN, do a name
  resolution, the request should not go to the public DNS server (to be
  checked by capturing the traffic by example with wireshark)

  
  * Regression potential

  The code change the handling of DNS servers when using a VPN, we
  should check that name resolution still work whne using a VPN in
  different configurations

  -----------------

  
  In 16.04 the NetworkManager package used to carry this patch:
  
http://bazaar.launchpad.net/~network-manager/network-manager/ubuntu/view/head:/debian/patches/Filter-DNS-servers-to-add-to-dnsmasq-based-on-availa.patch

  It fixed the DNS setup so that when I'm on the VPN, I am not sending
  unencrypted DNS queries to the (potentially hostile) local
  nameservers.

  This patch disappeared in an update. I think it was present in
  1.2.2-0ubuntu0.16.04.4 but was dropped some time later.

  This security bug exists upstream too: 
https://bugzilla.gnome.org/show_bug.cgi?id=746422
  It's not a *regression* there though, as they didn't fix it yet 
(unfortunately!)

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