编辑源列表文件：
sudo gedit /etc/apt/sources.list
然后把你找到的源地址加进去就行了，不要的源直接删除
下面是我的源
＃＃交通大学源
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
##163
# deb http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
##电子科技大学
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
＃＃这个是ubuntu的主题源（三方）
deb http://ppa.launchpad.net/bisigi/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/bisigi/ppa/ubuntu jaunty main
