Ubuntu server 用的163的源，报错：
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-updates/main/i18n/Translation-en Hash Sum mismatch
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en Hash Sum mismatch
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-security/main/i18n/Translation-en Hash Sum mismatch
Ubuntu 源列表：http://wiki.ubuntu.org.cn/%E6%BA%90%E5%88%97%E8%A1%A8
换sohu的源就好了
deb http://mirrors.sohu.com/ubuntu/ vivid main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-backports main restricted universe multiverse