重写/etc/apt/sources.list文件
$ echo 'deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse\n\
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse\n\
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse\n\
deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse\n\
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse\n\
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse\n\
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse\n\
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse\n\
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse\n\
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse\n\
' > /etc/apt/sources.list
