I managed to re-create the error, although today it took me a few tries. I
realized that perhaps I'm the cause of the problem. Specifically, the error
occurs after the following steps:
1) In "Software Sources", enable a new source (e.g. ppa.launchpad development
package), close, and reload.
2) Launch update manager (either manually or automatically) ---> new updates
appear
3) Launch "Software Sources" again while update manager is open, but before
installing the updates, disable the same source, close and reload
4) Error pops up.
Here is the CLI output:
:~$ apt-config dump | grep Update
APT::Periodic::Update-Package-Lists "1";
APT::Update "";
APT::Update::Post-Invoke-Success "";
APT::Update::Post-Invoke-Success:::: "touch
/var/lib/apt/periodic/update-success-stamp 2>/dev/null || true";
APT::Update::Post-Invoke-Success:: "/usr/bin/dbus-send --system
--dest=org.freedesktop.PackageKit --type=method_call
/org/freedesktop/PackageKit org.freedesktop.PackageKit.StateHasChanged
string:'cache-update'";
:~$ dpkg -l | grep packagekit
ii gstreamer0.10-packagekit 0.3.6-0ubuntu4
GStreamer plugin to install codecs using Pac
ii libpackagekit8 0.3.6-0ubuntu4
Library for accessing PackageKit
ii packagekit 0.3.6-0ubuntu4
provides a software installation daemon
ii packagekit-backend-apt 0.3.6-0ubuntu4
APT backend for packagekit
If the error occurs again in a different situation, I will be sure to note why.
--
E: The package cache file is corrupted E: _cache->open() failed, please report.
https://bugs.launchpad.net/bugs/257639
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