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

[Loïc Minier]

I've got a similar failure with "do-release-upgrade" on an up-to-date 10.04 install trying to upgrade to precise; looking at /var/log/dist-upgrade/20121227-1750/main_pre_req.log I see:
[...]
2012-12-27 17:50:05,220 DEBUG adding 'deb http://archive.ubuntu.com/ubuntu/ lucid-updates main
' prerequists
2012-12-27 17:50:05,220 DEBUG running doUpdate() (showErrors=False)
2012-12-27 17:50:05,423 DEBUG openCache()
2012-12-27 17:50:07,065 DEBUG /openCache(), new cache size 39742
2012-12-27 17:50:07,069 DEBUG marking 'libapt-pkg4.12' for install
2012-12-27 17:50:07,082 DEBUG marking 'libapt-inst1.4' for install
2012-12-27 17:50:07,094 DEBUG marking 'release-upgrader-python-apt' for install
2012-12-27 17:50:07,105 INFO cache.commit()
2012-12-27 17:50:07,105 DEBUG failed to SystemUnLock() (E:Not locked)
2012-12-27 17:50:07,113 ERROR Exception during pm.DoInstall()
Traceback (most recent call last):
  File "/tmp/tmpi9IMqo/DistUpgradeView.py", line 203, in run
    res = pm.do_install(self.writefd)
SystemError: E:Couldn't configure pre-depend multiarch-support for libapt-pkg4.12, probably a dependency cycle.
2012-12-27 17:50:07,213 ERROR installArchives returned 'installArchives() failed'
2012-12-27 17:50:07,213 WARNING _fetchArchives for backports returned False

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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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