更新源错误，换成以下就OK了
# This file was created by deepin software center, please do not modify manually!

deb http://mirrors.163.com/ubuntu trusty main restricted universe multiverse
deb http://mirrors.163.com/ubuntu trusty-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu trusty-updates main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu trusty-proposed main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu trusty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu trusty main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu trusty-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu trusty-updates main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu trusty-proposed main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu trusty-backports main restricted universe multiverse

deb http://mirror.sysu.edu.cn/deepin trusty main universe non-free
deb-src http://mirror.sysu.edu.cn/deepin trusty main universe non-free
#deb http://mirror.sysu.edu.cn/deepin trusty-updates main universe non-free
#deb-src http://mirror.sysu.edu.cn/deepin trusty-updates main universe non-free

我都是换中科大的镜像站的。