[Bug 1782275] Re: Conflict between resolvconf and systemd-resolved dhclient scripts

[Dan Streetman]

*** This bug is a duplicate of bug 1853164 ***
    https://bugs.launchpad.net/bugs/1853164

** This bug has been marked a duplicate of bug 1853164
   systemd: /etc/dhcp/dhclient-enter-hooks.d/resolved error

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https://bugs.launchpad.net/bugs/1782275

Title:
  Conflict between resolvconf and systemd-resolved dhclient scripts

Status in resolvconf package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  I am setting up an Ubuntu 18.04 (bionic) system with ifupdown instead
  of netplan, as the latter does not meet my needs. I am using
  resolvconf to update /etc/resolv.conf from DHCP, as in earlier
  releases.

  Unfortunately, I am not seeing /etc/resolv.conf (actually a symlink to
  /run/resolvconf/resolv.conf) being updated; it is only the boilerplate
  from /etc/resolvconf/resolv.conf.d/head with no server information
  appended. (My "base" and "tail" files are empty.)

  I poked around the scripts in /etc, and believe I have found the
  problem.

  When resolvconf is installed, the following two files are present:

      /etc/dhcp/dhclient-enter-hooks.d/resolvconf
      /etc/dhcp/dhclient-enter-hooks.d/resolved

  Both of these scripts define the make_resolv_conf() shell function.
  What I am seeing is that dhclient runs these two scripts in the
  (alphabetical) order shown, and as the resolved script runs second, it
  overwrites the resolvconf version of the shell function with its own.
  As a result, dhclient does not invoke the appropriate update command
  for resolvconf, even though the hook script was installed correctly.

  Normally, I would remove the package that is providing the "resolved"
  script, but this package is systemd, which cannot be removed. I am not
  sure which of the two packages (resolvconf or systemd) needs to make
  an accommodation for the other, but it is clear that the current
  approach does not work.

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