分享Ubuntu 16.04 几个国内更新源。 如何更改源 1/ 在修改source.list前，最好先备份一份
执行备份命令
sudo cp /etc/apt/sources.list /etc/apt/sources.list.old 2/ 执行命令打开source.list文件：可以用vim，gedit,atom等工具打开
sudo vim /etc/apt/source.list或
sudo gedit /etc/apt/source.list或(你得自己安装atom，我觉得挺好的一个工具)
sudo atom /etc/apt/source.list 3/复制源把下面的任意一下复制到source.list中去，并覆盖原来的文件内容。
东北大学源 deb-src .neu.edu.cn/ubuntu/ xenial main restricted #Added by software-properties deb .neu.edu.cn/ubuntu/ xenial main restricted deb-src .neu.edu.cn/ubuntu/ xenial restricted multiverse universe #Added by software-properties deb .neu.edu.cn/ubuntu/ xenial-updates main restricted deb-src .neu.edu.cn/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties deb .neu.edu.cn/ubuntu/ xenial universe deb .neu.edu.cn/ubuntu/ xenial-updates universe deb .neu.edu.cn/ubuntu/ xenial multiverse deb .neu.edu.cn/ubuntu/ xenial-updates multiverse deb .neu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb-src .neu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties deb .canonical.com/ubuntu xenial partner deb-src .canonical.com/ubuntu xenial partner deb .neu.edu.cn/ubuntu/ xenial-security main restricted deb-src .neu.edu.cn/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties deb .neu.edu.cn/ubuntu/ xenial-security universe deb .neu.edu.cn/ubuntu/ xenial-security multiverse 清华大学 # deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb .tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted deb .tuna.tsinghua.edu.cn/ubuntu/ xenial universe deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe deb .tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe deb .tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse阿里云源
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb-src .ubuntu.com/ubuntu xenial main restricted #Added by software-properties deb .aliyun.com/ubuntu/ xenial main restricted deb-src .aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties deb .aliyun.com/ubuntu/ xenial-updates main restricted deb-src .aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties deb .aliyun.com/ubuntu/ xenial universe deb .aliyun.com/ubuntu/ xenial-updates universe deb .aliyun.com/ubuntu/ xenial multiverse deb .aliyun.com/ubuntu/ xenial-updates multiverse deb .aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src .aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties deb .canonical.com/ubuntu xenial partner deb-src .canonical.com/ubuntu xenial partner deb .aliyun.com/ubuntu/ xenial-security main restricted deb-src .aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties deb .aliyun.com/ubuntu/ xenial-security universe deb .aliyun.com/ubuntu/ xenial-security multiverse 4/update命令 sudo apt-get update