[Bug 2067897] Re: Ubuntu 24.04 does not install resolvconf uses systemd-resolved instead which is broken

[John Orr]

In case it's useful to anyone else, here's the commands I'm running to start/stop my VPN, without making any changes to the strongswan config, and work around the issues above.
Start VPN:
    sudo systemctl restart systemd-networkd.service  # to avoid the error Unit dbus-org.freedesktop.network1.service not found

    # Start the VPN - expect errors about assigning DNSs to the "lo" interface
    sudo swanctl -i -c child_name_goes_here

    # Get interface of default route with the lowest metric
    iface=$(ip -j route | jq -r '.[] | select(.dst == "default") | .dev + " " + (.metric // 1000000 | tostring)' | sort -k2 -n | head -n1 | cut -d ' ' -f1)

    # Add known name servers, eg
    sudo resolvectl dns $iface 10.0.0.1 10.0.0.2

    # Add search path
    sudo resolvectl domain $iface mydomain.com my.other.domain.com


And to stop the VPN:
    sudo swanctl -t -i child_name_goes_here

    # Get interface of default route with the lowest metric
    iface=$(ip -j route | jq -r '.[] | select(.dst == "default") | .dev + " " + (.metric // 1000000 | tostring)' | sort -k2 -n | head -n1 | cut -d ' ' -f1)

    # Drop the interface, in order to bring it up again and reset its nameservers. This takes a while
    sudo ip link set $iface down
    while sudo resolvectl dns $iface | grep -q 10.0.0.1 ; do
      echo "  waiting for $iface to go down"
      sleep 1
    done
    sudo ip link set $iface up

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Title:
  Ubuntu 24.04 does not install resolvconf uses systemd-resolved instead
  which is broken

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  # lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 24.04 LTS
  Release:	24.04

  # dpkg --status systemd
  Package: systemd
  Status: install ok installed
  Priority: important
  Section: admin
  Installed-Size: 11728
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Multi-Arch: foreign
  Version: 255.4-1ubuntu8

  # dpkg --status systemd-resolved
  Package: systemd-resolved
  Status: install ok installed
  Priority: important
  Section: admin
  Installed-Size: 884
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Multi-Arch: foreign
  Source: systemd
  Version: 255.4-1ubuntu8
  Replaces: resolvconf, systemd (<< 251.3-2~)
  Provides: resolvconf

  WHAT HAPPENS:

  # /sbin/resolvconf -a lo.ipsec
  Dropped protocol specifier '.ipsec' from 'lo.ipsec'. Using 'lo' (ifindex=1).
  nameserver 8.8.8.8
  Failed to set DNS configuration: Unit dbus-org.freedesktop.network1.service not found.

  background, using strongswan vpn (swanctl) the error:

  installing DNS server 192.168.170.10 via resolvconf
  2024-06-03T12:22:51.802864+02:00 tester213 charon-systemd[3121]: resolvconf: Dropped protocol specifier '.ipsec' from 'lo.ipsec'. Using 'lo' (ifindex=1).
  2024-06-03T12:22:51.809365+02:00 tester213 dbus-daemon[714]: [system] Activating via systemd: service name='org.freedesktop.network1' unit='dbus-org.freedesktop.network1.service' requested by ':1.115' (uid=0 pid=3161 comm="/sbin/resolvconf -a lo.ipsec" label="unconfined")
  2024-06-03T12:22:51.809660+02:00 tester213 dbus-daemon[714]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.network1.service': Unit dbus-org.freedesktop.network1.service not found.
  2024-06-03T12:22:51.810206+02:00 tester213 charon-systemd[3121]: resolvconf: Failed to set DNS configuration: Unit dbus-org.freedesktop.network1.service not found.
  2024-06-03T12:22:51.811158+02:00 tester213 charon-systemd[3121]: adding DNS server failed
  2024-06-03T12:22:51.811282+02:00 tester213 charon-systemd[3121]: installing DNS server 192.168.170.10 via resolvconf
  2024-06-03T12:22:51.828246+02:00 tester213 charon-systemd[3121]: resolvconf: Dropped protocol specifier '.ipsec' from 'lo.ipsec'. Using 'lo' (ifindex=1).
  2024-06-03T12:22:51.830988+02:00 tester213 dbus-daemon[714]: [system] Activating via systemd: service name='org.freedesktop.network1' unit='dbus-org.freedesktop.network1.service' requested by ':1.116' (uid=0 pid=3165 comm="/sbin/resolvconf -a lo.ipsec" label="unconfined")
  2024-06-03T12:22:51.831891+02:00 tester213 dbus-daemon[714]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.network1.service': Unit dbus-org.freedesktop.network1.service not found.
  2024-06-03T12:22:51.833400+02:00 tester213 charon-systemd[3121]: resolvconf: Failed to set DNS configuration: Unit dbus-org.freedesktop.network1.service not found.
  2024-06-03T12:22:51.836087+02:00 tester213 charon-systemd[3121]: adding DNS server failed
  2024-06-03T12:22:51.836233+02:00 tester213 charon-systemd[3121]: handling INTERNAL_IP4_DNS attribute failed
  2024-06-03T12:22:51.836297+02:00 tester213 charon-systemd[3121]: installing DNS server 192.168.170.10 via resolvconf
  2024-06-03T12:22:51.852643+02:00 tester213 charon-systemd[3121]: resolvconf: Dropped protocol specifier '.ipsec' from 'lo.ipsec'. Using 'lo' (ifindex=1).
  2024-06-03T12:22:51.854550+02:00 tester213 dbus-daemon[714]: [system] Activating via systemd: service name='org.freedesktop.network1' unit='dbus-org.freedesktop.network1.service' requested by ':1.117' (uid=0 pid=3169 comm="/sbin/resolvconf -a lo.ipsec" label="unconfined")
  2024-06-03T12:22:51.854995+02:00 tester213 dbus-daemon[714]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.network1.service': Unit dbus-org.freedesktop.network1.service not found.
  2024-06-03T12:22:51.855363+02:00 tester213 charon-systemd[3121]: resolvconf: Failed to set DNS configuration: Unit dbus-org.freedesktop.network1.service not found.
  2024-06-03T12:22:51.856505+02:00 tester213 charon-systemd[3121]: adding DNS server failed
  2024-06-03T12:22:51.857409+02:00 tester213 charon-systemd[3121]: handling INTERNAL_IP4_DNS attribute failed

  WHAT SHOULD HAPPEN : the vpn dns server should be added without an
  error

  why can`t I install plain resolvconf which was working perfectly fine in Ubuntu 22.04 (tried to use the binary of 2204, the issue persists, the culprit is systemd in 2404)?
  24.04 forces me to use systemd-resolved which does not work as expected.

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