国内的源东西不是很全，推荐下面的源。
#####################FFICIAL UBUNTU REPOS ################### ############################################################# ###### Ubuntu Main Repos deb http://cn.archive.ubuntu.com/ubuntu/ precise main restricted universe deb-src http://cn.archive.ubuntu.com/ubuntu/ precise main restricted universe ###### Ubuntu Update Repos deb http://cn.archive.ubuntu.com/ubuntu/ precise-security main restricted universe deb http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe deb http://cn.archive.ubuntu.com/ubuntu/ precise-proposed main restricted universe deb http://cn.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-security main restricted universe deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-proposed main restricted universe deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe ###### Ubuntu Partner Repo deb http://archive.canonical.com/ubuntu precise partner deb-src http://archive.canonical.com/ubuntu precise partner ###### Ubuntu Extras Repo deb http://extras.ubuntu.com/ubuntu precise main deb-src http://extras.ubuntu.com/ubuntu precise main
如果想自定义源，请上：http://repogen.simplylinux.ch/
可以根据地区等自定义。