I suspect that this problem came from new apt version :
apt (0.7.6ubuntu1) gutsy; urgency=low
...
* merged apt--sha256 branch to fully support the new
sha256 checksums in the Packages and Release files
(ABI break)
-- Michael Vogt <[EMAIL PROTECTED]> Thu, 02 Aug 2007 11:55:54
+0200
--
Hash Sum mismatch
https://bugs.launchpad.net/bugs/130813
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