[Bug 1742903] Re: Microcode updates require a reboot to apply, but package postinst doesn't touch /run/reboot-required

[Steve Beattie]

The needrestart package has some sophisticated logic to detect whether
the system needs to be booted to get an updated microcode applied
(needrestart -w is how it can be invoked directly to report on microcode
status). The needrestart package is a bit much to be included as a
dependency or even a recommends for the intel-microcode package, but re-
using some of the logic might be appropriate.

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https://bugs.launchpad.net/bugs/1742903

Title:
  Microcode updates require a reboot to apply, but package postinst
  doesn't touch /run/reboot-required

Status in intel-microcode package in Ubuntu:
  Triaged
Status in intel-microcode source package in Bionic:
  Triaged

Bug description:
  The intel-microcode postinst script prints this text to standard error

      intel-microcode: microcode will be updated at next boot

  but tools like unattended-upgrades don't parse stderr, they expect a
  /run/reboot-required to exist to tell them that a reboot is needed to
  complete the update.

  Can you fix the postinst script to touch /run/reboot-required?

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