[Bug 936870] Re: unattended upgrade failing due to incorrectly detected conffile prompt due to "newconffile" line

[Tim Cutts]

Yep, it's very odd.  I don't know how the status file gets into that
state.  It might be a bug in dpkg.  dhcpcd wasn't the only package
affected - I did see it on one other (can't remember which, now - I put
cfengine code in place on our systems to spot this problem and sanitise
the status file, so the evidence isn't there any more)

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Title:
  unattended upgrade failing due to incorrectly detected conffile prompt
  due to "newconffile" line

Status in “unattended-upgrades” package in Ubuntu:
  Triaged
Status in “unattended-upgrades” source package in Precise:
  Triaged

Bug description:
  On severa hundredl of our Ubuntu machines, we have unattended upgrades
  active.  Over the weekend, this started reporting on all machines with
  dhcpcd installed that it could not upgrade that package due to a
  conffile prompt.  This looks very similar to #773007  and #336558,
  both of which are marked as fixed.

  On one of the machines, I've run unattended-upgrades --debug, and
  attached the output below.  The MD5 sums seem to match (which is a
  relief - I didn't think I was modifying these files), so I don't know
  why the conffile prompt is being detected.  If I run apt-get safe-
  upgrade on its own, it successfully upgrades the package with no
  prompting.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: unattended-upgrades 0.55ubuntu7
  ProcVersionSignature: Ubuntu 2.6.32-37.81-server 2.6.32.49+drm33.21
  Uname: Linux 2.6.32-37-server x86_64
  Architecture: amd64
  Date: Mon Feb 20 10:06:00 2012
  InstallationMedia: Ubuntu-Server 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.2)
  PackageArchitecture: all
  ProcEnviron:
   SHELL=/usr/local/bin/bash
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
  SourcePackage: unattended-upgrades

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