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After an upgrade of raspbian I rebooted the system and it printed the following message:

"mounting /dev/mmcblk0p2 on /root failed: No such device"

After that an emergency shell (busybox) appeared. When I mounted the partition it worked without any problems. I changed the filesystem to vfat because I thought some kernel modules were missing, but it didn't help.

How can I debug this?

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    Probably quickest to reimage and start again.
    – joan
    Aug 10, 2022 at 13:28
  • What OS are you using? Raspberry Pi OS hasn't used /dev/mmcblk0p2 for years! Did you fiddle with cmdline.txt?
    – Milliways
    Aug 10, 2022 at 23:51

1 Answer 1

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Thanks to joan, I compared my system to a standard image and realized, that I forgot to change the rootfstype in /boot/cmdline.txt

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