# zfs-native 0.6.5.7 - Kernel Downgrade to 4.4.0-57
# Does not build with 4.4.0-59

# Install previous good kernel
apt-get install linux-image-4.4.0-57-generic linux-image-extra-4.4.0-57-generic

# Replace primary boot kernel (vmlinuz and initrd.img) in grub.cfg
sed -E "s/\/(vmlinuz|initrd\.img)-4\.4\.0-59-generic/\/\1-4.4.0-57-generic/g" /boot/grub/grub.cfg > /tmp/grub-modified-4.4.0-57.cfg

# CHECK THE GENERATED FILE. Then update grub.cfg

cp -v /boot/grub/grub.cfg /tmp/grub.$(date +%Y-%m-%d-%H-%M-%S)-.bak
cp -v /tmp/grub-modified-4.4.0-57.cfg /boot/grub/grub.cfg

# Reboot
shutdown -r now