[Bug 1304403] Re: Precise to Trusty - all of main - fails: Broken transition from libkadm5srv-mit8 to libkadm5srv-mit9

[Michael Vogt]

I uploaded a workaround with a transitional package. I also looked into what went wrong in the resolver. Here is what happend:
- pkgDistUpgrade goes over the installed package and mark them all for upgrade
- pkg libkadm5srv-mit9 gets installed as a dependency of krb5-multidev and causes the removal of libkadm5srv-mit8
- pkgDistUpgrade arrives at libkadm5srv-mit8 and marks it for upgrade which causes a MarkKeep() because there is no upradable version 

The last step is wrong in libapt, I will look into creating a
testcase/fix for this.

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Title:
  Precise to Trusty - all of main - fails: Broken transition from
  libkadm5srv-mit8 to libkadm5srv-mit9

Status in “krb5” package in Ubuntu:
  In Progress
Status in “ubuntu-release-upgrader” package in Ubuntu:
  Won't Fix
Status in “krb5” source package in Trusty:
  In Progress
Status in “ubuntu-release-upgrader” source package in Trusty:
  Won't Fix

Bug description:
  Precise to Trusty upgrade + all of main failure:

  2014-04-08 12:58:48,335 DEBUG blacklist expr '^postgresql-.*[0-9]\.[0-9].*' matches 'postgresql-server-dev-9.1'
  2014-04-08 12:58:48,335 DEBUG The package 'postgresql-server-dev-9.1' is marked for removal but it's in the removal blacklist
  2014-04-08 12:58:48,357 ERROR Dist-upgrade failed: 'The package 'postgresql-server-dev-9.1' is marked for removal but it is in the removal blacklist.'
  2014-04-08 12:58:48,358 DEBUG abort called

  REPRODUCER:
   * Start a precise schroot
   * apt-get install krb5-multidev
   * Switch apt sources to trusty
   * apt-get update
   * apt-get dist-upgrade → This will remove krb5-multidev instead of upgrading

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