第一步:
备份源列表:sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup(备份当前源列表)
第二步:
修改更新源:sudo vi /etc/apt/sources.list
第三部:
替换源:
<1>.来自163网
deb http://mirrors.163.com/ubuntu/ precise main restricted
deb-src http://mirrors.163.com/ubuntu/ precise main restricted
deb http://mirrors.163.com/ubuntu/ precise-updates main restricted
deb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted
deb http://mirrors.163.com/ubuntu/ precise universe
deb-src http://mirrors.163.com/ubuntu/ precise universe
deb http://mirrors.163.com/ubuntu/ precise-updates universe
deb-src http://mirrors.163.com/ubuntu/ precise-updates universe
deb http://mirrors.163.com/ubuntu/ precise multiverse
deb-src http://mirrors.163.com/ubuntu/ precise multiverse
deb http://mirrors.163.com/ubuntu/ precise-updates multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-updates multiverse
deb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ precise-security main restricted
deb-src http://mirrors.163.com/ubuntu/ precise-security main restricted
deb http://mirrors.163.com/ubuntu/ precise-security universe
deb-src http://mirrors.163.com/ubuntu/ precise-security universe
deb http://mirrors.163.com/ubuntu/ precise-security multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-security multiverse
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
<2>来自sohu
deb http://mirrors.sohu.com/ubuntu/ precise main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise main restricteddeb http://mirrors.sohu.com/ubuntu/ precise-updates main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricteddeb http://mirrors.sohu.com/ubuntu/ precise universedeb-src http://mirrors.sohu.com/ubuntu/ precise universedeb http://mirrors.sohu.com/ubuntu/ precise-updates universedeb-src http://mirrors.sohu.com/ubuntu/ precise-updates universedeb http://mirrors.sohu.com/ubuntu/ precise multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise multiversedeb http://mirrors.sohu.com/ubuntu/ precise-updates multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiversedeb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiversedeb http://mirrors.sohu.com/ubuntu/ precise-security main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise-security main restricteddeb http://mirrors.sohu.com/ubuntu/ precise-security universedeb-src http://mirrors.sohu.com/ubuntu/ precise-security universedeb http://mirrors.sohu.com/ubuntu/ precise-security multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-security multiversedeb http://extras.ubuntu.com/ubuntu precise maindeb-src http://extras.ubuntu.com/ubuntu precise main<3>来自ubunu的推荐deb http://ubuntu.cn99.com/ubuntu/ precise main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu/ precise-updates main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu/ precise-security main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu/ precise-backports main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu-cn/ precise main restricted universe multiverse<4>来自电子科技大学deb http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse<5>来自中国科技大学deb http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-backports restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse<6>来自北京交通大学deb http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
最后一步
更新列表:sudo apt-get update