Hi, This bug can be easier to fix than we thought. :-D
As a workaround, you only have to execute:
$ sudo mkdir /sys/fs/cgroup/unified/{machine,system,user}
The folders should be created at libvirtd start, probably manually with
some extra cgroup magic that I don't understand yet, but this works
well and new machines can be created. I'll take a look this week into
the libvirtd service if nobody takes it first, as this is quite trivial.
Best regards,
Miguel
