Install MongoDB Community Edition in Debian 9

We must install libssl1.0.0 which is not inside Debian 9's official repositories.

Let's execute this commands:

$ wget http://security.debian.org/debian-security/pool/updates/main/o/openssl/libssl1.0.0_1.0.1t-1+deb7u3_amd64.deb
$ sudo dpkg -i libssl1.0.0_1.0.1t-1+deb7u3_amd64.deb
$ sudo apt install dirmngr
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2930ADAE8CAF5059EE73BB4B58712A2291FA4AD5
$ sudo su
# echo "deb http://repo.mongodb.org/apt/debian jessie/mongodb-org/3.6 main" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.6.list
# exit
$ sudo apt update
$ sudo apt install -y mongodb*

Done!