apt-get update problem

[Bernd Worsch <bernd.worsch@web.de>]

Me again!

Apropos update/upgrade capabilities. Recently my modem-ppp connection
broke, while "apt-get update" was in progress. Since then there seems
to be a problem with "apt-get update", it says: 

Hit http://security.debian.org potato/updates/main Packages
Hit http://security.debian.org potato/updates/main Release
...
Hit http://ftp.de.debian.org potato/non-US/non-free Packages
Hit http://ftp.de.debian.org potato/non-US/non-free Release
Hit http://ftp.de.debian.org potato/main Sources
Ign http://ftp.de.debian.org potato/main Release
Hit http://ftp.de.debian.org potato/contrib Sources
Ign http://ftp.de.debian.org potato/contrib Release
Hit http://ftp.de.debian.org potato/non-free Sources
Ign http://ftp.de.debian.org potato/non-free Release
Err http://ftp.de.debian.org potato/non-US Sources
  404 Not Found
Ign http://ftp.de.debian.org potato/non-US Release
Reading Package Lists...
Building Dependency Tree...
Failed to fetch http://ftp.de.debian.org/debian-non-US/dists/potato/non-US/source/Sources
  404 Not Found
E: Some index files failed to download, they have been ignored, or old ones used instead.


What is the problem? 
How to correct it?
Was it triggered by the braking connection?


Thanks
Bernd


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