[Bug 2006589] Re: Anacron service and timer disabled after upgrading from 2.3-33

[Adrien Nader]

I'm attaching another patch.

It backups the symlinks in preinst and restores them in postinst.
Overall it feels cleaner than my previous changes and the symlinks
should be unaltered. I output warnings (although on stdout now that I
think of it) from both preinst and postinst in order to warn about what
will be done and to warn about what has been done, along with the
symlink targets for debug (and now that I think of it, I shouldn't
assume they are symlinks).

The changelog isn't cleaned up; I'll do that once the review is (mostly)
cleared.

** Patch added: "anacron_2.3-36ubuntu1-to-2.3-36ubuntu2~ppa4.diff"
   https://bugs.launchpad.net/ubuntu/+source/anacron/+bug/2006589/+attachment/5647064/+files/anacron_2.3-36ubuntu1-to-2.3-36ubuntu2~ppa4.diff

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https://bugs.launchpad.net/bugs/2006589

Title:
  Anacron service and timer disabled after upgrading from 2.3-33

Status in anacron package in Ubuntu:
  Confirmed

Bug description:
  As hinted by https://lists.debian.org/debian-devel-
  announce/2022/11/msg00001.html , anacron 2.3-33's packaging has a bug
  which disables both the timer and service when its postrm script is
  invoked and that includes upgrades from this package.

  We need to work-around this issue since it is the version in kinetic.

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