[Bug 1993193] Re: Inconsistent DNS configuration in manual settings

[Olivier Gayot]

Similar bug report that mentions duplicate search domains too:
https://bugs.launchpad.net/subiquity/+bug/1998920

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https://bugs.launchpad.net/bugs/1993193

Title:
  Inconsistent DNS configuration in manual settings

Status in subiquity package in Ubuntu:
  New

Bug description:
  when editing the IPv4 configuration of a given nic multiple times, the
  `Name servers:` field gets reset (it's not pre-filled when the form
  gets opened again).

  In the meantime, systemd-resolved seems to keep the old values in
  memory.

  The `Gateway:" field also gets reset when opening the edit screen
  multiple times (which is not ideal) but the output of `ip -4 route`
  seems consistent.

  Steps to reproduce:

  1. On the network screen, choose one nic and do the following:

  * Edit IPv4 (Manual) -> Name servers: 1.2.3.4 -> Save
  * Edit IPv4 (Manual) -> Name servers: 2.3.4.5 -> Save
  * Edit IPv4 (Manual) -> Name servers: 9.8.7.6 -> Save

  each time the edit screen will be opened, the Name servers value will
  be empty.

  2. Run the resolvectl command and check the output:

  $ resolvectl
  Global
         Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
  resolv.conf mode: foreign
        DNS Domain: lxd

  Link 2 (ens3)
      Current Scopes: DNS
           Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
  Current DNS Server: 2.3.4.5
         DNS Servers: 1.2.3.4 2.3.4.5 9.8.7.6

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