1 错误描述
youhaidong@youhaidong:~$ cd 下载
youhaidong@youhaidong:~/下载$ sudo apt-get update
忽略 http://cn.archive.ubuntu.com trusty InRelease
忽略 http://cn.archive.ubuntu.com trusty-updates InRelease
忽略 http://cn.archive.ubuntu.com trusty-backports InRelease
命中 http://cn.archive.ubuntu.com trusty Release.gpg
命中 http://cn.archive.ubuntu.com trusty-updates Release.gpg
命中 http://cn.archive.ubuntu.com trusty-backports Release.gpg
命中 http://cn.archive.ubuntu.com trusty Release
命中 http://cn.archive.ubuntu.com trusty-updates Release
命中 http://cn.archive.ubuntu.com trusty-backports Release
命中 http://cn.archive.ubuntu.com trusty/main Sources
命中 http://cn.archive.ubuntu.com trusty/restricted Sources
忽略 http://extras.ubuntu.com trusty InRelease
命中 http://cn.archive.ubuntu.com trusty/universe Sources
命中 http://cn.archive.ubuntu.com trusty/multiverse Sources
命中 http://cn.archive.ubuntu.com trusty/main amd64 Packages
命中 http://cn.archive.ubuntu.com trusty/restricted amd64 Packages
命中 http://cn.archive.ubuntu.com trusty/universe amd64 Packages
命中 http://cn.archive.ubuntu.com trusty/multiverse amd64 Packages
命中 http://extras.ubuntu.com trusty Release.gpg
命中 http://cn.archive.ubuntu.com trusty/main i386 Packages
忽略 http://security.ubuntu.com trusty-security InRelease
命中 http://cn.archive.ubuntu.com trusty/restricted i386 Packages
命中 http://cn.archive.ubuntu.com trusty/universe i386 Packages
命中 http://cn.archive.ubuntu.com trusty/multiverse i386 Packages
命中 http://cn.archive.ubuntu.com trusty/main Translation-zh_CN
命中 http://extras.ubuntu.com trusty Release
获取：1 http://extras.ubuntu.com trusty/main Sources [1,064 kB]
命中 http://cn.archive.ubuntu.com trusty/main Translation-en
命中 http://cn.archive.ubuntu.com trusty/multiverse Translation-zh_CN
命中 http://cn.archive.ubuntu.com trusty/multiverse Translation-en
命中 http://cn.archive.ubuntu.com trusty/restricted Translation-zh_CN
命中 http://cn.archive.ubuntu.com trusty/restricted Translation-en
命中 http://cn.archive.ubuntu.com trusty/universe Translation-zh_CN
命中 http://security.ubuntu.com trusty-security Release.gpg
命中 http://cn.archive.ubuntu.com trusty/universe Translation-en
命中 http://cn.archive.ubuntu.com trusty-updates/main Sources
获取：2 http://extras.ubuntu.com trusty/main i386 Packages [1,348 kB]
命中 http://cn.archive.ubuntu.com trusty-updates/restricted Sources
命中 http://cn.archive.ubuntu.com trusty-updates/universe Sources
命中 http://cn.archive.ubuntu.com trusty-updates/multiverse Sources
命中 http://cn.archive.ubuntu.com trusty-updates/main amd64 Packages
命中 http://security.ubuntu.com trusty-security Release
命中 http://cn.archive.ubuntu.com trusty-updates/restricted amd64 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/universe amd64 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/multiverse amd64 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/main i386 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/restricted i386 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/universe i386 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/multiverse i386 Packages
命中 http://cn.archive.ubuntu.com trusty-updates/main Translation-en
命中 http://cn.archive.ubuntu.com trusty-updates/multiverse Translation-en
命中 http://cn.archive.ubuntu.com trusty-updates/restricted Translation-en
命中 http://cn.archive.ubuntu.com trusty-updates/universe Translation-en
命中 http://cn.archive.ubuntu.com trusty-backports/main Sources
命中 http://cn.archive.ubuntu.com trusty-backports/restricted Sources
命中 http://extras.ubuntu.com trusty/main Translation-en
命中 http://cn.archive.ubuntu.com trusty-backports/universe Sources
命中 http://cn.archive.ubuntu.com trusty-backports/multiverse Sources
命中 http://cn.archive.ubuntu.com trusty-backports/main amd64 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/restricted amd64 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/universe amd64 Packages
命中 http://security.ubuntu.com trusty-security/main Sources
命中 http://cn.archive.ubuntu.com trusty-backports/multiverse amd64 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/main i386 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/restricted i386 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/universe i386 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/multiverse i386 Packages
命中 http://cn.archive.ubuntu.com trusty-backports/main Translation-en
命中 http://security.ubuntu.com trusty-security/restricted Sources
命中 http://cn.archive.ubuntu.com trusty-backports/multiverse Translation-en
命中 http://cn.archive.ubuntu.com trusty-backports/restricted Translation-en
命中 http://cn.archive.ubuntu.com trusty-backports/universe Translation-en
命中 http://security.ubuntu.com trusty-security/universe Sources
命中 http://security.ubuntu.com trusty-security/multiverse Sources
命中 http://security.ubuntu.com trusty-security/main amd64 Packages
忽略 http://cn.archive.ubuntu.com trusty/main Translation-zh
忽略 http://cn.archive.ubuntu.com trusty/multiverse Translation-zh
忽略 http://cn.archive.ubuntu.com trusty/restricted Translation-zh
忽略 http://cn.archive.ubuntu.com trusty/universe Translation-zh
命中 http://security.ubuntu.com trusty-security/restricted amd64 Packages
命中 http://security.ubuntu.com trusty-security/universe amd64 Packages
命中 http://security.ubuntu.com trusty-security/multiverse amd64 Packages
忽略 http://extras.ubuntu.com trusty/main Translation-zh
命中 http://security.ubuntu.com trusty-security/main i386 Packages
命中 http://security.ubuntu.com trusty-security/restricted i386 Packages
命中 http://security.ubuntu.com trusty-security/universe i386 Packages
命中 http://security.ubuntu.com trusty-security/multiverse i386 Packages
命中 http://security.ubuntu.com trusty-security/main Translation-en
获取：3 http://extras.ubuntu.com trusty/main amd64 Packages [1,350 kB]
命中 http://security.ubuntu.com trusty-security/multiverse Translation-en
命中 http://security.ubuntu.com trusty-security/restricted Translation-en
命中 http://security.ubuntu.com trusty-security/universe Translation-en
忽略 http://extras.ubuntu.com trusty/main Translation-zh_CN
下载 1,064 kB，耗时 8秒 (127 kB/s)
W: 无法下载 bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_trusty_main_source_Sources Hash 校验和不符
W: 无法下载 bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages Hash 校验和不符
W: 无法下载 bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_trusty_main_binary-i386_Packages Hash 校验和不符
E: Some index files failed to download. They have been ignored, or old ones used instead.
2 错误原因
3 解决办法