Crash if installed packages are not in the APT cache

[Michalxo]

Binary package hint: gnome-codec-install

Karmic Koala Alpha 3
gnome-codec-install: Installed: 0.3.3ubuntu1
Wanted to install codecs.. then it threw this bug to me.

ProblemType: Crash
Architecture: amd64
Date: Sun Jul 26 11:30:15 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gnome-codec-install
InterpreterPath: /usr/bin/python2.6
LiveMediaBuild: Ubuntu 9.10 "Karmic Koala" - Alpha amd64 (20090722.2)
NonfreeKernelModules: nvidia
Package: gnome-codec-install 0.3.3ubuntu1
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gstreamer-codec-install --transient-for=50331651 gstreamer|0.10|totem|GStreamer\ element\ input-selector|element-input-selector gstreamer|0.10|totem|XVID\ MPEG-4\ decoder|decoder-video/x-xvid
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-3.19-generic
PythonArgs: ['/usr/bin/gstreamer-codec-install', '--transient-for=50331651', 'gstreamer|0.10|totem|GStreamer element input-selector|element-input-selector', 'gstreamer|0.10|totem|XVID MPEG-4 decoder|decoder-video/x-xvid']
SourcePackage: gnome-codec-install
Title: gnome-codec-install crashed with KeyError in __getitem__()
Uname: Linux 2.6.31-3-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Robert Ancell (robert-ancell)]

Buggy code is:
        cache = apt.Cache(GtkOpProgress())
        for pkgname in to_add:
            if not cache[pkgname].isInstalled:
                result = False

For some reason in this case pkgname is not in the cache