一些常用的源，感谢sly
#deb http://ftp.sjtu.edu.cn/ubuntu/ breezy main restricted universe multiverse
#deb http://ftp.sjtu.edu.cn/ubuntu/ breezy-security main restricted universe multiverse
#deb http://ftp.sjtu.edu.cn/ubuntu/ breezy-updates main restricted universe multiverse
#deb http://ubuntu.cn99.com/ubuntu/ breezy main restricted universe multiverse
#deb http://ubuntu.cn99.com/ubuntu/ breezy-updates main restricted universe multiverse
#deb http://ubuntu.cn99.com/ubuntu/ breezy-security main restricted universe multiverse
#deb http://ubuntu.cn99.com/ubuntu/ breezy-backports main restricted universe multiverse
#deb http://ubuntu.cn99.com/ubuntu-cn/ breezy main restricted universe multiverse
#deb http://ubuntu.cn99.com/backports/ breezy-extras main restricted universe multiverse
#deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ breezy main multiverse restricted universe
#deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ breezy-backports main multiverse restricted universe
#deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ breezy-proposed main multiverse restricted universe
#deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ breezy-security main multiverse restricted universe
#deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ breezy-updates main multiverse restricted universe