Public bug reported:
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.
** Affects: resolvconf (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1782275
Title:
Conflict between resolvconf and systemd-resolved dhclient scripts
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