Hello Jessica,

For me the problem seems to be solved since, by chance because of a 
different error,
I happened to use "check" as a gParted function.
Try to do the same (if you don't have it : wget-install gparted)
1) run gParted
2) unmount your Linux partition
3) open the menu "Partition - Check"
4) when finished (normally you'll be advised of successful operation) 
remount your partition
5) better reboot and everything should be ok, if not re-install your 
default sources list.
Greetings
Jean

Jessica Doyle a écrit :
> I have also received this error message on an Acer Aspire One running
> Ubuntu 8.10 (with some extra packages recommended for netbooks).  I do
> NOT have packagekit installed.
>
> When I enter "apt-config dump|grep Update" I get:
> 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";
>
> I only get this message when I run Update Manager manually.  If I check
> packages a second time after receiving the error message I do not get
> the error message again.
>
> One note -- I got the error message today (the update it was trying to
> get me was to acpi-support) and promptly lost my wireless connection,
> and when I restarted the computer failed to recognize my wireless card.
> (I had to download the madwifi driver to get it to see the wireless card
> in the first place.)  That may be a complete coincidence.
>
>

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