I'm trying to install ZFS on my NanoPi M4 with the rk3399-sd-friendlycore-bionic-4.4-arm64-20180921.img Image. It looks like i just need to install the kernel headers, but when i try apt says it couldn't find them. pi@MicroNAS:~$ sudo apt-get install linux-headers-$(uname -r) Reading package lists.....