linux 更新问题 源的设置

使用ubuntu在更新的时候，无法下载，并提示软件包损坏。在添加了软件源后（网易，交大，还有搜狐），却出现无法认证该源的数据。此外，有很多乎略是什么意思？如图：

首先要确定你添加的源没有问题， 第二，你是否把原来的源删除干净了

#网易的源（163源，无论是不是教育网，速度都很快）
deb http://mirrors.163.com/ubuntu/ raring main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ raring main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ raring-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ raring-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ raring-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ raring-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ raring-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ raring-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ raring-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ raring-updates universe main multiverse restricted

#搜狐的源（sohu 源今天还没有更新，不过应该快了）
deb http://mirrors.sohu.com/ubuntu/ raring main restricted
deb-src http://mirrors.sohu.com/ubuntu/ raring main restricted
deb http://mirrors.sohu.com/ubuntu/ raring-updates main restricted
deb-src http://mirrors.sohu.com/ubuntu/ raring-updates main restricted
deb http://mirrors.sohu.com/ubuntu/ raring universe
deb-src http://mirrors.sohu.com/ubuntu/ raring universe
deb http://mirrors.sohu.com/ubuntu/ raring-updates universe
deb-src http://mirrors.sohu.com/ubuntu/ raring-updates universe
deb http://mirrors.sohu.com/ubuntu/ raring multiverse
deb-src http://mirrors.sohu.com/ubuntu/ raring multiverse
deb http://mirrors.sohu.com/ubuntu/ raring-updates multiverse
deb-src http://mirrors.sohu.com/ubuntu/ raring-updates multiverse
deb http://mirrors.sohu.com/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ raring-backports main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ raring-security main restricted
deb-src http://mirrors.sohu.com/ubuntu/ raring-security main restricted
deb http://mirrors.sohu.com/ubuntu/ raring-security universe
deb-src http://mirrors.sohu.com/ubuntu/ raring-security universe
deb http://mirrors.sohu.com/ubuntu/ raring-security multiverse
deb-src http://mirrors.sohu.com/ubuntu/ raring-security multiverse
deb http://extras.ubuntu.com/ubuntu raring main
deb-src http://extras.ubuntu.com/ubuntu raring main

#电子科技大学
deb http://ubuntu.uestc.edu.cn/ubuntu/ raring main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ raring-backports main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ raring-proposed main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ raring-security main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ raring-updates main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ raring main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ raring-proposed main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ raring-security main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ raring-updates main restricted universe multiverse

#中国科技大学
deb http://debian.ustc.edu.cn/ubuntu/ raring main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ raring-backports restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ raring-proposed main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ raring-security main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ raring-updates main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ raring main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ raring-proposed main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ raring-security main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ raring-updates main restricted universe multiverse
#北京理工大学
deb http://mirror.bjtu.edu.cn/ubuntu/ raring main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ raring-backports main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ raring-proposed main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ raring-security main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ raring-updates main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ raring main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ raring-backports main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ raring-proposed main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ raring-security main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ raring-updates main multiverse restricted universe

#兰州大学
deb ftp://mirror.lzu.edu.cn/ubuntu/ raring main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ raring-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ raring-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ raring-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ raring-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ raring main multiverse restricted universe

#上海交通大学（上海交大源，教育网的速度不用说了）
deb http://ftp.sjtu.edu.cn/ubuntu/ raring main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ raring-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ raring-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ raring-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ raring-updates main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu-cn/ raring main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ raring main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ raring-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ raring-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ raring-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ raring-updates main multiverse restricted universe

添加好后保存，再输入 sudo apt-get update 就可以更新