deb http://cn.archive.ubuntu.com/ubuntu trusty main restricted
deb-src http://cn.archive.ubuntu.com/ubuntu trusty main restricted
deb http://cn.archive.ubuntu.com/ubuntu trusty-updates main restricted
deb-src http://cn.archive.ubuntu.com/ubuntu trusty-updates main restricted
deb http://cn.archive.ubuntu.com/ubuntu trusty universe
deb-src http://cn.archive.ubuntu.com/ubuntu trusty universe
deb http://cn.archive.ubuntu.com/ubuntu trusty-updates universe
deb-src http://cn.archive.ubuntu.com/ubuntu trusty-updates universe
deb http://cn.archive.ubuntu.com/ubuntu trusty multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu trusty multiverse
deb http://cn.archive.ubuntu.com/ubuntu trusty-updates multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu trusty-updates multiverse
deb http://cn.archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse