Bug#964926: systemd: systemctl show <service> prints "Failed to parse bus message: Invalid argument" before output

[Hugh Cole-Baker]

It turns out this is just caused by running a 5.8-rc kernel with systemd
compiled against linux-libc-dev 5.7, there's a new capability cap_bpf
that systemctl fails to display since it's not in linux/capability.h.

The same issue is described here, with a link to the upstream fix:

https://bugzilla.redhat.com/show_bug.cgi?id=1853736