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* packaging/ubuntu, packaging/debian: depend on dbus-session-bus provider On a cgroup v2 system, we rely on being able to set up a systemd scope for the snap applications. This is done by communicating with a proper systemd instance over a dbus bus, which for user session is the session bus. This only came up when one of the intermediate dependencies of ubuntu-server, had their dependencies updated and no longer requires session bus and we observed that it was impossible to launch snap applications that required device access on Ubuntu 21.10. Related to: - https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1951491 - https://forum.snapcraft.io/t/cannot-launch-snap-applications-with-cgroup-v2/27700 Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com> * spread: have ubuntu-core-18 be based on 18.04 images Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com> * packaging/ubuntu-16.04: depend on dbus-session-bus if not on 16.04 The (default-)dbus-session-bus was introduced only in 2018, so it's available in 18.04 but not in earlier releases, so revert to not having a special dependency on that release. Not having a session bus and lack of snap app tracking is not fatal on 16.04, but is a must on 21.10 where a snap specific cgroup created by dbus user instance is required for device access filtering. Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com> * tests/lib/pkgdb: dbus-user-session shall be pulled in through default-dbus-session-bus dependency Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com> * tests/lib/pkgdb: fix indentation Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com> * tests/main/lxd-snapfuse,lxd-try,lxd-mount-units: wait for container to be booted, run apt update before installing any packages Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com> * tests/main/lxd-try/task.yaml: fix typo Co-authored-by: Ian Johnson <person.uwsome@gmail.com>