Same problem with mirror.picosecond.org, which is the mirror that http.debian.net selects for me:
W: Failed to fetch bzip2:/var/lib/apt/lists/partial/mirror.picosecond.org_debian_dists_unstable_main_i18n_Translation-en Hash Sum mismatch W: Failed to fetch bzip2:/var/lib/apt/lists/partial/mirror.picosecond.org_debian_dists_experimental_main_i18n_Translation-en Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead. Seems like http://bugs.debian.org/674659 might be a duplicate of this bug. Note that this hash sum mismatch only happens for me on wheezy. My squeeze systems don't see these hash sum mismatches. -- Kenyon Ralph
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