[Bug 927274] Re: update-manager crashed with KeyError in __getitem__(): "The cache has no package named 'linux-headers-3.2.0-12'"

[Brian Murray]

I ran into this issue with a different package by performing the
following steps:

1) Launch update-manager
2) Check for updates (There must be updates available)
3) Click on settings
4) Switch to the "Ubuntu Software" tab
5) Choose a different server in "Download from: "
6) Click "Choose server"
7) Authenticate
8) Click "Close"
9) update-manager will now crash as it tries to look up one of the packages that used to be in the cache.

Additionally, the crash won't be reportable because apport thinks it is
not an official package as apt-cache policy shows the following:

9:47:51 - flash:[...ch/bug-attachments/plymouth] apt-cache policy update-manager
update-manager:
  Installed: 1:0.156.5
  Candidate: 1:0.156.5
  Version table:
 *** 1:0.156.5 0
        100 /var/lib/dpkg/status



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https://bugs.launchpad.net/bugs/927274

Title:
  update-manager crashed with KeyError in __getitem__(): "The cache has
  no package named 'linux-headers-3.2.0-12'"

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

Bug description:
  run the command sudo apt-get update and Update Manager is working
  again

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.2
  ProcVersionSignature: Ubuntu 3.2.0-11.19-generic 3.2.1
  Uname: Linux 3.2.0-11-generic x86_64
  ApportVersion: 1.91-0ubuntu1
  Architecture: amd64
  Date: Sun Feb  5 16:56:13 2012
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1328467355
   com.ubuntu.update-manager window-height 747
   com.ubuntu.update-manager window-width 611
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111212)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/bin/update-manager
  ProcEnviron:
   LANGUAGE=pt_BR:pt:en
   PATH=(custom, no user)
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/bin/update-manager']
  SourcePackage: update-manager
  Title: update-manager crashed with KeyError in __getitem__(): "The cache has no package named 'linux-headers-3.2.0-12'"
  UpgradeStatus: Upgraded to precise on 2012-01-28 (8 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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