Public bug reported:

When I attempted to launch synaptic for the first time in this installation I 
got an error message.
-------------
An error occurred
The following details are provided.
E: The value 'natty' is invalid for APT::Default-Release as such a release is 
not available in the sources
E: _cache->open() failed, please report.
-------------
After a Natty Xubuntu install a few weeks ago and virtually no modifications at 
all, I allowed release update. Then, 
since I wanted a fairly generic xfce4 desk I sought to disable the window 
border animation during move and I thought compiz-config may be able to change 
that.

I did apt-get install compiz-config and it seemed to install ok but I
could not find the menu item to run it.

That is when I decided to install synaptic and I got the error above at the 
first run.
Note that synaptic was not installed before. and there were no concurrently 
running package management applications.

After closing synaptic I was able to run ubuntu software center, but I
do regard that as a very much less functional application than synaptic.

I am not going to struggle with this installation because I already have a 
running Natty system on another partition.
I will just do a clean install of Xubuntu  Oneiric if I can find a website 
showing how to disable the window animations.

PS: I had hoped with xfce to avoid all that silly stuff that is wobbly
windows and Unity etc.

$> apt-cache policy synaptic
synaptic:
  Installed: 0.75.2ubuntu8
  Candidate: 0.75.2ubuntu8
  Version table:
 *** 0.75.2ubuntu8 0
        500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ oneiric/universe 
i386 Packages
        100 /var/lib/dpkg/status

$ lsb_release -rd
Description:    Ubuntu 11.10
Release:        11.10

Xfce4 desktop.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: synaptic 0.75.2ubuntu8
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Sun Oct 23 02:49:07 2011
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: synaptic
UpgradeStatus: Upgraded to oneiric on 2011-10-22 (0 days ago)

** Affects: synaptic (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 oneiric

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https://bugs.launchpad.net/bugs/880003

Title:
  Synaptic displays "An error occurred"

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