树莓派 ubuntu mate 16.0.4.2换软件源

树莓派在国内使用网络会很慢，所以我们将换为国内的数据源

sudo vim /etc/apt/sources.list

然后输入密码

然后进入vim编辑器，按 i 进入编辑，删除所有内容将以下的复制进去，然后按 esc 在按shift : 着两个一起按输入wq退出

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-updates main restricted universe multiverse

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-updates main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-security main restricted universe multiverse

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-security main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-backports main restricted universe multiverse

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-backports main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial main universe restricted

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial main universe restricted

然后执行更新

pi@raspberrypi:~$ sudo apt-get update       #更新系统软件
pi@raspberrypi:~$ sudo apt-get upgrade       #更新已安装的包