[Bug 1874337] [NEW] resolvconf should never touch /etc/resolv.conf in Ubuntu; all DNS configuration from resolvconf, ifupdown, and dhclient should always be fed directly to systemd-resolved.

[Steve Langasek]

Public bug reported:

systemd-resolved is a standard component of Ubuntu in 20.04.  We should
not have packages in the archive - some of which may be installed on
users' systems as a result of upgrading from previous releases - that
cause the handling of DNS resolution to diverge from the default.

This means that:

- the dhclient hook that picks up DNS settings should only feed settings directly to resolved, and not via resolvconf.
- resolvconf must not change the target of /etc/resolv.conf and on upgrade must correct it.
- resolvconf must feed its settings reliably into resolved rather than pulling resolved settings into resolvconf.
- systemd should not ship a dhclient hook at all because dhclient is not used by any systems that use netplan for network management, it is only needed for compatibility on upgrade with ifupdown; so move the hook to the ifupdown package.

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: resolvconf (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: ifupdown (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1874337

Title:
  resolvconf should never touch /etc/resolv.conf in Ubuntu; all DNS
  configuration from resolvconf, ifupdown, and dhclient should always be
  fed directly to systemd-resolved.

Status in ifupdown package in Ubuntu:
  New
Status in resolvconf package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  systemd-resolved is a standard component of Ubuntu in 20.04.  We
  should not have packages in the archive - some of which may be
  installed on users' systems as a result of upgrading from previous
  releases - that cause the handling of DNS resolution to diverge from
  the default.

  This means that:

  - the dhclient hook that picks up DNS settings should only feed settings directly to resolved, and not via resolvconf.
  - resolvconf must not change the target of /etc/resolv.conf and on upgrade must correct it.
  - resolvconf must feed its settings reliably into resolved rather than pulling resolved settings into resolvconf.
  - systemd should not ship a dhclient hook at all because dhclient is not used by any systems that use netplan for network management, it is only needed for compatibility on upgrade with ifupdown; so move the hook to the ifupdown package.

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