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(fedora) linux and zfs on linux with error message "Failed to load ZFS module stack."

You are getting error messages like the following by trying to use your zfs?

Failed to load ZFS module stack.
Load the module manually by running 'insmod /zfs.ko' as root.
Failed to load ZFS module stack.
Load the module manually by running 'insmod /zfs.ko' as root.
First, check if all modules (zfs is using dkms) are loaded and having the same/fitting version numbers.
dkms status
If the output is not suiteable (one module is missing, wrong version number for example) try to do the following steps by using the proper version number.
dkms remove -m zfs -v 0.6.2 --all
dkms remove -m spl -v 0.6.2 --all
dkms add -m spl -v 0.6.2
dkms add -m zfs -v 0.6.2
dkms install -m spl -v 0.6.2
dkms install -m zfs -v 0.6.2