1、执行sudo gedit /etc/apt/sources.list，删除其中的内容，添加
deb http://mirrors.163.com/ubuntu / maverick main universe restricted multiverse
deb http://security.ubuntu.com/ubuntu/ maverick-security universe main multiverse restricted
deb-src http://security.ubuntu.com/ubuntu/ maverick-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ maverick-updates universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ maverick-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ maverick-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ maverick-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ maverick main universe restricted multiverse
2、sudo apt-get update 更新源列表信息
3、sudo apt-get upgrade 升级