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当我检查更新时，出现“无法下载存储库信息”错误。

这是详细信息下的内容：

W: Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_natty_main_source_Sources  Hash Sum mismatch, 
E: Some index files failed to download. They have been ignored, or old ones used instead.