先备份自己的源文件：
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
sudo gedit /etc/apt/sources.list
然后复制下面的源覆盖原来的源里面的内容
#台湾源
deb precise main universe restricted multiverse
deb-src precise main universe restricted multiverse
deb precise-security universe main multiverse restricted
deb-src precise-security universe main multiverse restricted
deb precise-updates universe main multiverse restricted
deb-src precise-updates universe main multiverse restricted
#网易
deb precise main universe restricted multiverse
deb-src precise main universe restricted multiverse
deb precise-security universe main multiverse restricted
deb-src precise-security universe main multiverse restricted
deb precise-updates universe main multiverse restricted
deb precise-proposed universe main multiverse restricted
deb-src precise-proposed universe main multiverse restricted
deb precise-backports universe main multiverse restricted
deb-src precise-backports universe main multiverse restricted
deb-src precise-updates universe main multiverse restricted
#骨头源
deb precise main universe restricted multiverse
deb-src precise main universe restricted multiverse
deb precise-security universe main multiverse restricted
deb-src precise-security universe main multiverse restricted
deb precise-updates universe main multiverse restricted
deb precise-proposed universe main multiverse restricted
deb-src precise-proposed universe main multiverse restricted
deb precise-backports universe main multiverse restricted
deb-src precise-backports universe main multiverse restricted
deb-src precise-updates universe main multiverse restricted
#mirror.lupaworld.com的源
deb precise main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise main restricted universe multiverse
#ubuntu.cn99.com源
deb precise main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise main restricted universe multiverse
#电子科技大学
deb precise main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise-proposed main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb-src precise main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb-src precise-proposed main restricted universe multiverse
deb-src precise-security main restricted universe multiverse
deb-src precise-updates main restricted universe multiverse
#中国科技大学
deb precise main restricted universe multiverse
deb precise-backports restricted universe multiverse
deb precise-proposed main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb-src precise main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb-src precise-proposed main restricted universe multiverse
deb-src precise-security main restricted universe multiverse
deb-src precise-updates main restricted universe multiverse
#北京理工大学
deb precise main multiverse restricted universe
deb precise-backports main multiverse restricted universe
deb precise-proposed main multiverse restricted universe
deb precise-security main multiverse restricted universe
deb precise-updates main multiverse restricted universe
deb-src precise main multiverse restricted universe
deb-src precise-backports main multiverse restricted universe
deb-src precise-proposed main multiverse restricted universe
deb-src precise-security main multiverse restricted universe
deb-src precise-updates main multiverse restricted universe
#兰州大学
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe
#上海交通大学
deb precise main multiverse restricted universe
deb precise-backports main multiverse restricted universe
deb precise-proposed main multiverse restricted universe
deb precise-security main multiverse restricted universe
deb precise-updates main multiverse restricted universe
deb precise main multiverse restricted universe
deb-src precise main multiverse restricted universe
deb-src precise-backports main multiverse restricted universe
deb-src precise-proposed main multiverse restricted universe
deb-src precise-security main multiverse restricted universe
deb-src precise-updates main multiverse restricted universe
最后执行更新命令：
sudo apt-get update
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