### Bug Description The 20.04 spread testcraft tests fail when using the Multipass backend due to issues with regular 24.04 containers running on 20.04 hosts. This same [issue](https://github.com/canonical/craft-application/pull/1091#discussion_r3443418878) affected tests with the openstack backend and was fixed by using an hwe image. ### To Reproduce `spread multipass:ubuntu-20.04-64` ### Relevant log output ```shell 2026-07-02 13:35:30 Error executing multipass:ubuntu-20.04-64:tests/spread/testcraft/pack-multi (multipass:ubuntu-20.04-64) : ----- + testcraft pack Launching managed ubuntu 24.04 instance... Creating new instance from remote Creating new base instance from remote Failed to setup systemd-resolved. * Command that failed: 'lxc --project testcraft exec local:base-instance-testcraft-buildd-base-v71--729cbdbcf5f5dd399dba -- env CRAFT_MANAGED_MODE=1 TESTCRAFT_DEBUG=True TESTCRAFT_LXD_REMOTE=local TESTCRAFT_LAUNCHPAD_INSTANCE=production DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true DEBIAN_PRIORITY=critical systemctl restart systemd-resolved' * Command exit code: 1 * Command standard error output: b'Job for systemd-resolved.service failed because the control process exited with error code.\nSee "systemctl status systemd-resolved.service" and "journalctl -xeu systemd-resolved.service" for details.\n' Full execution log: '/root/.local/state/testcraft/log/testcraft-20260702-133339.533606.log' ----- . 2026-07-02 13:35:30 Restoring multipass:ubuntu-20.04-64:tests/spread/testcraft/pack-multi (multipass:ubuntu-20.04-64)... 2026-07-02 13:35:32 Discarding multipass:ubuntu-20.04-64... 2026-07-02 13:35:32 Successful tasks: 15 2026-07-02 13:35:32 Aborted tasks: 0 2026-07-02 13:35:32 Failed tasks: 4 - multipass:ubuntu-20.04-64:tests/spread/testcraft/ignore-test-files - multipass:ubuntu-20.04-64:tests/spread/testcraft/lint - multipass:ubuntu-20.04-64:tests/spread/testcraft/pack-multi - multipass:ubuntu-20.04-64:tests/spread/testcraft/state error: unsuccessful run ```