raspberry upgrade fuckup

Also, falls ihr mal diesen diversen howtos für das Upgrade eines Raspis inplace von 10 auf 11 folgt:

How To Upgrade To Raspberry Pi OS 11 Bullseye (From Buster)
Raspberry Pi OS “Bullseye” (based on Debian 11 Bullseye) has been released recently, and this article covers the instructions for upgrading from the o

Äh - "don't do it" - danach war der headless Raspi nicht mehr erreichbar. Die Lösung war dann das hier:

Fix error “Failed to start DHCP Client Daemon” after upgrade to “Bullseye” remote?
This is a non problem. DO NOT attempt "upgrade" - follow the advice to do a fresh install, NOT a kludge to "fix" the "problem". I did an upgrade to Bullseye and reboo…

Immerhin, Raspi wieder am Leben.