99% [15 Packages bzip2 0] [正在等待报头] 7114B/s 0sbzip2: (stdin) is not a bzip2 file.
错误 http://security.ubuntu.com dapper-security/main Packages
子进程 bzip2 返回了一个错误号 (2)
命中 http://security.ubuntu.com dapper-security/multiverse Sources
下载 82.4kB，耗时 17s (4790B/s)
无法下载 http://security.ubuntu.com/ubuntu/dists ... ckages.bz2 子进程 bzip2 返回了一个错误号 (2)
正在读取软件包列表... 完成
W: Duplicate sources.list entry http://cn.archive.ubuntu.com dapper/main Packages (/var/lib/apt/lists/cn.archive.ubuntu.com_ubuntu_dists_dapper_main_binary-i386_Packages)
W: Duplicate sources.list entry http://cn.archive.ubuntu.com dapper/restricted Packages (/var/lib/apt/lists/cn.archive.ubuntu.com_ubuntu_dists_dapper_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://cn.archive.ubuntu.com dapper-updates/main Packages (/var/lib/apt/lists/cn.archive.ubuntu.com_ubuntu_dists_dapper-updates_main_binary-i386_Packages)
W: Duplicate sources.list entry http://cn.archive.ubuntu.com dapper-updates/restricted Packages (/var/lib/apt/lists/cn.archive.ubuntu.com_ubuntu_dists_dapper-updates_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com dapper-security/main Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_dapper-security_main_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com dapper-security/restricted Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_dapper-security_restricted_binary-i386_Packages)
W: 您可能需要运行 apt-get update 来解决这些问题
E: 有一些索引文件不能下载，它们可能被忽略了，也可能转而使用了旧的索引文件。

如果你装的是6.10,那你的源写错了，把源里面的dapper改成edgy。

看提示阿，都说你有重复的源了，自己修改一下。