[Bug 1817903] Re: systemd-resolve appends "options edns0" to resolv.conf

[Steve Roberts]

My update was from 237-3ubuntu10.11, which didn't have the problem (12
was never installed)

It seems I cannot easily downgrade via apt or synaptic, as the previous
versions do not seem to be in the repos, can you advise how to do so?

On a different machine on the same network I still have 237-3ubuntu10.11
and it is working as expected (and I don't want to update!)

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Title:
  systemd-resolve appends "options edns0" to resolv.conf

Status in systemd package in Ubuntu:
  New

Bug description:
  Mint 19 (Ubuntu 18.04)

  Following latest mint update done on 24/02/2019, DNS is broken....

  nslookup and dig of certain domain names work as expected, ping does
  not (ip works but not domain name)

  After a day of trial and error, testing I found that the problem lies
  with the presence of

  "options edns0"

  in /run/resolvconf/resolv.conf (link to by /etc/resolv.conf)

  With option present many dns lookups fail with both FF and chrome browswers and thunderbird...
  This is on a home network, with router set as dns proxy for external wan, not using NetworkManager

  Deleting the option on live system results in the issue immediately
  disappearing, but on reboot it is added back in (by systemd-resolve ?)

  I cannot find any option to prevent this being added, so presumably it
  is hard-coded in systemd following the update?

  systemd:
    Installed: 237-3ubuntu10.13

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