[ubuntu] apt

[xinyou yan]

Hello everyone:

    I use ubuntu 11.4 ,and want to update the software list.
    Using the  commander  sudo apt-get update .

    failed at

 W: 无法下载 bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_natty_main_source_Sources
 Hash 校验和不符

 E: Some index files failed to download. They have been ignored, or
old ones used instead.

(
  I come from china .
 无法下载 ：  can't download
 校验和不符：Checksum does not match:
 )

thank you .

PS , I think  the problem Software Sources  . I didn't change anything
after installed it.

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