Hi Malcom,

yesss. Sometimes i'm unable to see the wood for the trees. Unfortunately i didn't create /var/log/journal, which is necessary that systemd stores persistent logs. I had not, so currently i don't have logs from the failed boot. But i created it now (following man 5 journald.conf), so if the error appears again (it surely will) i can't check now what's going wrong.
Thanks.
Bernd