安装的时候提示：
The repository 'http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.0 Release' does not have a Release file.
解决办法：
先清掉原来的源
sudo rm /etc/apt/sources.list.d/mongodb*.list
再重新添加
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
sudo bash -c 'echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse" > /etc/apt/sources.list.d/mongodb-org-3.2.list'
sudo apt update
sudo apt install mongodb-org
