i dont have virtualisation of vmware kind or anything similar. on my other troubled machine I actually tried the command provided dpg-ppb-smu-tux01:~ # snapper list Failure (org.freedesktop.DBus.Error.Spawn.ExecFailed). and this machine (non rebooted yet after dup) is unable to run it due to probably the same systemd and related bugs we are discussing here, so the second machine will probably behave the same way (i am currently unable to access it, can report more later) but all of them have ext4 only, no btrfs