yesterday I did a small dist upgrade that actually bricked my system. The only thing I was able to reach was busybox which told me after invoking “sh init”
mount none failed for /dev, device busy
mount none failed for /sys, device busy
Booting from a Live CD showed that I was indeed able to mount the partitions without any trouble. Invoking update-grub or update-initramfs did’t improve the situation.
What finally worked was to disable the raid autodetect in grub:
Thanks to that my system boots and I can finally work again on some real stuff 🙂