Vi/etc/apt/sources.list 14.04deb http://mirrors.aliyun.com/ubuntu/trusty main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/trusty-security main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/trusty-updates main restricted universe multiverse
Deb http://mirrors.aliyun.com/ubuntu/trusty-proposed main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/trusty-backports main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/trusty main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/trusty-security main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/trusty-updates main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/trusty-proposed main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/trusty-backports main restricted universe multiverse
sudo apt-get update
http://wiki.ubuntu.org.cn/Source list 16.04deb http://mirrors.aliyun.com/ubuntu/xenial main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/xenial-security main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/xenial-updates main restricted universe multiverse
Deb http://mirrors.aliyun.com/ubuntu/xenial-proposed main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/xenial-backports main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-security main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-updates main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-proposed main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-backports main restricted universe multiverse
Ubuntu Source Settings