• Boot time reduced from 100s to around 30s
• Messing with apt-mark or flash-kernel is no longer necessary and the fix has been built into the image
• Fixed bluetooth firmware bug that was looking in /etc/firmware instead of /lib/firmware
• Fixed entropy bug causing slow startup
• Fixed mdadm.conf RAID warning
• Module.symvars is now available in /boot/firmware/ if you need it to build kernel modules
  If you need the whole source tree check out the accompanying build script in the repository. It's exactly the same as how the kernel and modules were built.
• Various other fixes (special thanks to Joan at jamesachambers.com for contributing so many)
• More at https://jamesachambers.com/raspberry-pi-ubuntu-server-18-04-2-installation-guide/