This shows in total these error lines if you encounter this:
Failed to load ZFS module stack.
Load the module manually by running 'insmod <location>/zfs.ko' as root.
This is most likely to be a dependency issue and I solved it by running this command:
sudo apt-get remove `uname -r` zfs-dkms ubuntu-zfs
Then, without in-between reboot:
sudo apt-get install `uname -r`
And after that:
sudo apt-get install zfs-dkms ubuntu-zfs
Thanks to jameswyse at ubuntuforums