Comment 9 for bug 1770082

Ok, so the bit I'm stuck on is how the link files and the netplan generator are getting pulled into the initramfs then.

ubuntu@btest:~$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.15.0-20-generic

ubuntu@btest:~$ lsinitramfs /boot/initrd.img-4.15.0-20-generic | grep \\.link
lib/systemd/network/99-default.link
ubuntu@btest:~$ lsinitramfs /boot/initrd.img-4.15.0-20-generic | grep netplan
ubuntu@btest:~$ lsinitramfs /boot/initrd.img-4.15.0-20-generic | grep generate
ubuntu@btest:~$ lsinitramfs /boot/initrd.img-4.15.0-20-generic | grep system-generators

As you can see there's no generator and no link files in my initramfs - by what mechanism is it supposed to work? What package/script/tool is supposed to pull the link files in?