Or, actually, not exactly. We don't want the stub-resolv.conf since
systemd-resolved is leaving, but we probably do want the options.

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https://bugs.launchpad.net/bugs/2056153

Title:
  Removing the systemd-resolved package breaks DNSSEC validation

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Removing the systemd-resolved package breaks glibc DNSSEC validation,
  because it removes an existing line from the new /etc/resolv.conf
  file.

  This line should be retained so that packages like Exim can continue
  to use the AD bit after systemd-resolved is removed.

  
  ubuntu@instance:~$ grep -v '^#' /etc/resolv.conf

  nameserver 127.0.0.53
  options edns0 trust-ad
  search vcn.oraclevcn.com

  
  ubuntu@instance:~$ sudo apt remove systemd-resolved

  
  ubuntu@instance:~$ grep -v '^#' /etc/resolv.conf

  nameserver 169.254.169.254
  search vcn.oraclevcn.com

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