Comment 3 for bug 1647032

Thank you for taking the time to report this bug and helping to make Ubuntu better. The relevant dpkg terminal log says:

update-initramfs: Generating /boot/initrd.img-4.4.0-51-generic
E: No boot partition found !
run-parts: /etc/initramfs/post-update.d//zz-flash-touch-initrd exited with return code 1

The failing zz-flash-touch-initrd comes from initramfs-tools-ubuntu-touch. So re-assigning to initramfs-tools-ubuntu-touch.