/sbin/zpool: Undefined symbol zfs_nicenum (at initramfs prompt)

[Binarus]

Dear all,

today I've decided to follow these instructions to always have the newest ZFS release on my Debian bookworm systems. Until now, I had compiled ZFS myself from time to time, but now thought that it would be more convenient to get it from distribution packages.

After following the instructions I've linked above, I couldn't boot the system any more. It goes to the initramfs prompt where it gets stuck because zpool can't mount the pools and outputs the error message denoted in the subject.

I don't know whether this is a bug or whether I've done something wrong (the instructions I've linked are easy enough to follow, though).

Could somebody please tell me how to get out of there?

Thank you very much in advance!

[Binarus]

To answer my own question:

It was Debian's fault. For some reason the ZFS upgrade went wrong, failing to remove the old versions of the userland utilities and libraries completely, and leading to a mixture of the new 2.2.5 userland utilities and the old 2.2.0 libraries installed in parallel to the new 2.2.5 libraries.

I was able to resolve the situation by manually deleting the old libraries, executing ldconfig and regenerating the initramfs. Afterwards, the system booted normally.

I'll now close this issue, but I don't delete it in case somebody has the same problem.