Debian Install failure: Hash Sum Mismatch

[arne anka]

> I ha(ve|d) this problem today, too, but don't know about any cause or
> solution...

i step in the right direction would have been to shorten the mail before  
replying ;-)

first thing i'd try would be
apt-get update && apt-get upgrade
if the errors persist, either your sd card is faulty or apt has issues or  
the infamous sd card bug strikes again (how big is your sd card?) ...

download the archive(s) manually and compare the checksums
# apt-cache show fso-utils
Package: fso-utils
Version: 0.git20080812.2
Architecture: all
Maintainer: Joachim Breitner <nomeata at debian.org>
Installed-Size: 76
Depends: python-dbus, python
Suggests: gsm0710muxd
Priority: extra
Section: misc
Filename: pool/main/f/fso-utils/fso-utils_0.git20080812.2_all.deb
Size: 11872
SHA256: a294c93a0ab62b54d30009bd14a234be43b4a9e11d4c5ea9d081eff7644d846a
SHA1: 67fbec63110961999e3e3dde81316e251e71baf5
MD5sum: 6134ea91b8da82d393a13ef012e907db
Description: Useful tools for the freesmartphone.org system
  TODO


MD5sum has the md5sum (surprise), now do
# md5sum fso-utils_0.git20080812.2_all.deb
6134ea91b8da82d393a13ef012e907db  fso-utils_0.git20080812.2_all.deb

if the sums are the same, the package is most likely ok. put it into  
/var/cache/apt/archives/.
do so with the others.
now do
apt-get upgrade
it should work now -- if not you're probably out of look with your sd card.