I thought we were going to some effort to reduce the number of systems
where resolveconf was going to be used, or even remove it from the
distro entirely.

Thanks

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https://bugs.launchpad.net/bugs/1853164

Title:
  systemd: /etc/dhcp/dhclient-enter-hooks.d/resolved error

Status in systemd package in Ubuntu:
  Triaged
Status in systemd source package in Focal:
  Triaged

Bug description:
  The functionality exists to allow users to revert to the traditional ifupdown 
  package for network configuration. Alongside this, systemd's often-buggy 
  resolver can be disabled. However, there's a logic error in the systemd-
  supplied /etc/dhcp/dhclient-enter-hooks.d/resolved that prevents the system
  from populating /etc/resolv.conf properly when systemd-resolved is disabled. 
  The issue is here:

      if [ -x /lib/systemd/systemd-resolved ] ; then

  Instead of checking to see if the systemd-resolved service is enabled or 
  active, which would be the correct behaviour, this checks for the existence of
  a binary, assuming that if it exists it's supposed to be used.

  I've not tested this in the absence of resolvconf, but if systemd-resolved 
  isn't enabled, it's difficult to imagine this code wanting to run. I've 
tested 
  this with resolvconf and ifupdown driving dhclient, and it corrects the 
  behaviour that was broken with the introduction of systemd-resolved.

  I'm attaching a patch, and am also including it here for easy access:

  *** resolved.broken     2019-11-19 15:01:28.785588838 +0000
  --- resolved    2019-11-19 15:08:06.519430073 +0000
  ***************
  *** 14,20 ****
    #   (D) = master script downs interface
    #   (-) = master script does nothing with this

  ! if [ -x /lib/systemd/systemd-resolved ] ; then
            # For safety, first undefine the nasty default make_resolv_conf()
            make_resolv_conf() { : ; }
            case "$reason" in
  --- 14,21 ----
    #   (D) = master script downs interface
    #   (-) = master script does nothing with this

  ! systemctl is-active systemd-resolved > /dev/null 2>&1
  ! if [ $? -eq 0 ]; then
            # For safety, first undefine the nasty default make_resolv_conf()
            make_resolv_conf() { : ; }
            case "$reason" in

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