[Bug 1002815] Re: failed upgrade from 10.04.4 to 12.04

[Loïc Minier]

I ran "apt-get install libapt-pkg4.12" manually, that pulled a bunch of
other updates including multiarch-support, then ran do-release-upgrade
again; I've got scary warnings and had to "apt-get -f install", "apt-get
upgrade" and "apt-get dist-upgrade" but eventially completed the upgrade
after multiple trials.

At some point I was stuck upgrading to python 2.7, apt-get install python2.7-minimal said:
The following packages have unmet dependencies:
  python-apt: Recommends: xz-lzma but it is not going to be installed
              Breaks: apt-listchanges (< 2.85) but 2.84 is to be installed
so I passed -o APT::Immediate-Configure=0 to apt-get dist-upgrade and it passed.  Obviously this is a dangerous workaround as it delays configuration of essential packages.

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https://bugs.launchpad.net/bugs/1002815

Title:
  failed upgrade from 10.04.4 to 12.04

Status in “update-manager” package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I just ran 'do-release-upgrade -m server -d' on an up-to-date lucid
  server. This failed with the following error:

  Exception during pm.DoInstall():  E:Could not perform immediate
  configuration on 'python2.7-minimal'.Please see man 5 apt.conf under
  APT::Immediate-Configure for details. (2)

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