[Bug 1573275] [NEW] ifupdown should not hard-depend upon 'mountkernfs' and 'urandom'

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'/etc/init.d/networking' for 'ifupdown' starts with:

  # Required-Start:    mountkernfs $local_fs urandom

it would appear that 'mountkernfs' and 'urandom' are not hard-
dependencies, and their presence prevents successful installation in
virtual machines in some circumstances.  This was reported by Neal
Gompa/<Pharaoh_Atem> on #ubuntu-devel whilst working on support for Suse
Open Build System (OBS) to build Xenial packages:

http://changelogs.ubuntu.com/changelogs/pool/main/i/ifupdown/ifupdown_0.8.10ubuntu1/changelog

Full and snipped output logs are at:

  http://paste.fedoraproject.org/358318/61266534/
  https://paste.fedoraproject.org/358315/66065146/

in particular:

  [  530s] [239/256] installing ifupdown-0.8.10ubuntu1
  [  530s] Creating /etc/network/interfaces.
  [  531s] insserv: Service mountkernfs has to be enabled to start service networking
  [  531s] insserv: Service urandom has to be enabled to start service networking
  [  531s] insserv: exiting now!
  [  531s] update-rc.d: error: insserv rejected the script header
  [  531s] dpkg: error processing package ifupdown (--install):
  [  531s]  subprocess installed post-installation script returned error exit status 1

The reporter tested that commenting out 'mountkernfs' and 'urandom'
allowed the ifupdown '/etc/init.d/networking' init-script to
successfully complete.

Ideally a hard-dependency should not be declared if it is not actually a
hard-dependency, and introduces a regression by  preventing successfully
installation in circumstances that are reported to have worked
previously for installing earlier Debian/Ubuntu versions on OBS.

** Affects: ifupdown (Ubuntu)
     Importance: Medium
         Status: Confirmed


** Tags: bot-comment regression-release
-- 
ifupdown should not hard-depend upon 'mountkernfs' and 'urandom'
https://bugs.launchpad.net/bugs/1573275
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