@bhkolts: Thank you for your feedback. Linux-image-extra-4.4.0-138-generic.postrm still runs /etc/kernel/postinst.d/update-notifier that places /var/run/reboot-required, the file u-u acts upon and reboots.
Update-notifier is fixed in Bionic, but I'm hereby nominating the fix for Xenial.
@bhkolts: Thank you for your feedback. Linux-image- extra-4. 4.0-138- generic. postrm still runs /etc/kernel/ postinst. d/update- notifier that places /var/run/ reboot- required, the file u-u acts upon and reboots.
Update-notifier is fixed in Bionic, but I'm hereby nominating the fix for Xenial.