[Bug 936870] [NEW] unattended upgrade failing due to incorrectly detected conffile prompt

[Tim Cutts]

Public bug reported:

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

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

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https://bugs.launchpad.net/bugs/936870

Title:
  unattended upgrade failing due to incorrectly detected conffile prompt

Status in “unattended-upgrades” package in Ubuntu:
  New

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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