I’ve been using Manoj’s new kernel-package for some weeks now, and used it to compile two kernels (a reconfigured 220.127.116.11 and the new 18.104.22.168). Both times I’ve had trouble with initrd.
As the documentation says, kernel-package kernel packages no longer do their own initramfs generation. One must copy the example scripts at /usr/share/doc/kernel-package/examples/etc.kernel/postinst.d/initramfs and /usr/share/doc/kernel-package/examples/etc.kernel/postrm.d/initramfs to the appropriate subdirectories of /etc/kernel/. However, this is not enough.
My /etc/kernel-img.conf file had the usual posthook and prehook lines calling update-grub. Unfortunately, those hooks are called before the postinst.d hooks, and so update-grub never saw my initramfs images.
Fix? I removed those lines from /etc/kernel-img.conf and created a very simple postinst.d and postrm.d script:
I call the script zzz-grub-local, to ensure that it runs last.