thx mate . this worked for me !!
I just change my download source.
my error was ...
GPG error: http://us.archive.ubuntu.com oneiric-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
You can do the above steps it just that you have to re-add the other repository that you had before renaming the lists folder. Its linux and you can do different methods but same result.
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