Karmic. The same issue.
The problem is in intermediate proxy serveversm which caches file, that
should not be cached. In my experiments, bug never-triggered on FTP. Bug
disappear after removing transparent proxy. Bug disappear after
disabling cache on transparent proxy.
Solution:
1. after the fail, try all known HTTP methods to force non-caching behaviour
(Example of PHP header to fool caching proxy). Both for datafile and for
signature!
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); //
always modified
header('Cache-Control: no-cache, must-revalidate'); // HTTP/1.1
header('Pragma: no-cache'); // HTTP/1.0
2. wait for wget fixes this bug: https://savannah.gnu.org/bugs/index.php?28137
3. Use FTP ot HTTPS protocols where available.
--
apt-get update failing with bad signature.
https://bugs.launchpad.net/bugs/24234
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