We need logs. But you are right, it doesnt work for me either right now. Looking at the systemd logs I get this:
Mai 03 10:44:53 T440p-void systemd[2536]: Started Anbox Session Manager.
Mai 03 10:44:54 T440p-void anbox[2543]: Failed to initialize EGL
Mai 03 10:44:54 T440p-void anbox[2543]: Failed to start container: Failed to start container: Failed to set config item lxc.group.devices.deny
Mai 03 10:44:54 T440p-void anbox[2543]: Lost connection to container manager, terminating.
Mai 03 10:44:54 T440p-void anbox[2543]: Container is not running
Mai 03 10:44:54 T440p-void anbox[2543]: Stack trace (most recent call last) in thread 2897:
Mai 03 10:44:54 T440p-void anbox[2543]: #5 Object "", at 0xffffffffffffffff, in
Mai 03 10:44:54 T440p-void systemd[2536]: anbox-session-manager.service: Main process exited, code=exited, status=1/FAILURE
Mai 03 10:44:54 T440p-void systemd[2536]: anbox-session-manager.service: Failed with result 'exit-code'.
which is pretty much the same issue reported here:
Best thing to do is to keep track of the issues
Edit: downgrading lxc to 4.0.6 is indeed a temporary fix, taken from above linked issue