On 20221016 I applied an update to LTS Kernel515 (Linux 5.15.72-1) with zfs and virtualbox dkms module support. After reboot virtualbox gave me errors related to no modules loaded. Later, while searching for hints on what to do I also tried a simple #zpool -list command which also indicated no modules found. After trying things like reloading the linux515 kernel using the GUI as well as mhwd-kernel, and then trying to load an earlier kernel, I did some investigating into what versions of linux515 kernel was in the core repositories and found the actual latest version if Linux 5.15.74 so no wonder I got this message in my /var/log.pacman.log “ERROR: Missing 5.15.72-1-MANJARO kernel headers for module zfs/2.1.6.”
While this is probably an error that needs to be fixed by whomever sent the automated update package, how can I now recover as to the best of my knowledge I cant get back to an earlier version of the header and *.zst file.
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This sounds like the classic partial update due to unsynced mirrors.
/usr/lib/modules/extramodules-5.15-MANJARO is a fixed folder, for extramodules for the Linux5.15 and that is where the
linux515-zfs would install and load from.
Either from chroot system or from single user TTY, run this command:
sudo pacman-mirrors -f5 && sudo pacman -Syyu linux515-zfs
This problem was fixed in a single item update pushed by the update-manager. Consider the problem solved, but not by any of my actions!
Your seer sync’s later, more slowly than thought…or something. Because with that update it fixed the problems you had that would’ve been fixed with @bogdancovaciu’s instructions.