The service unit file for usbguard does not work with systemd of Leap 15.2

  coredumpctl | grep usbguard-daemon | wc -l
  30

so I had disabled it

* usbguard.service - USBGuard daemon
   Loaded: loaded (/usr/lib/systemd/system/usbguard.service; disabled; vendor
preset: disabled)
   Active: failed (Result: signal) since Wed 2020-07-15 09:00:04 CEST; 5 days
ago
     Docs: man:usbguard-daemon(8)
 Main PID: 1351 (code=killed, signal=SYS)

Jul 18 09:16:32 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:42 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:43 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:43 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:44 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:46 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:46 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:47 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 08:02:47 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'
Jul 20 14:51:16 boole systemd[1]: /usr/lib/systemd/system/usbguard.service:13:
Unknown lvalue 'LockPersonality' in section 'Service'


Btw: it seems that the usbguard applet is not part of the package anymore, that
is it becomes unusable for non-GNOME users.