I get this same message almost every time I use "Software Sources" in
the following scenario:

After adding a new source, or removing a source, I then reload.  All the
package information seems to download, but then then this error pops up.

I then switch to terminal and do 
sudo apt-get update

and everything appears fine.

-- 
E: The package cache file is corrupted E: _cache->open() failed, please report.
https://bugs.launchpad.net/bugs/257639
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