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>>>I am trying to install packages and some of them fail with MD5 errors,
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If you are getting bad sums on the packages, especially from unstable, 
then it's likely dpkg/apt "available" package cache  hasn't been updated 
recently with the new package checksums.  It's also quite possible that 
some mirrors are being updated slower than others, thus causing some 
inconsistancy when using round robin.   Normally, this hasn't been a 
problem.  The last Debian release though seems less consistant on that 
point, however.

If you update your  systems from the same mirror consistantly at regular 
intervals, it seems to resolve the problem.

T.J.

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