Cannot download from repository

[Koutheir Attouchi]

# apt-get update
Failed to fetch http://mozilla.debian.net/dists/squeeze-backports/Release
Unable to find expected entry  icedove-release/binary-i386/Packages in
Meta-index file (malformed Release file?)
Some index files failed to download, they have been ignored, or old ones
used instead.

Koutheir ATTOUCHI.
LinkedIn profile: http://tn.linkedin.com/in/koutheirattouchi
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