wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add -
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/5.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list
sudo apt-get update
sudo apt-get install -y mongodb-org

# https://www.mongodb.com/docs/manual/tutorial/install-mongodb-on-ubuntu/
sudo apt-get install gnupg
wget -qO - https://www.mongodb.org/static/pgp/server-6.0.asc | sudo apt-key add -
# for Ubuntu 20.04
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/6.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-6.0.list
sudo apt-get update
sudo apt-get install -y mongodb-org
# if you get "mongodb-org-mongos : Depends: libssl1.1 (>= 1.1.1) but 1.1.0l-1~deb9u6 is to be installed" error
# https://stackoverflow.com/questions/50375979/getting-error-while-installing-mongodb-in-linux
wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1-1ubuntu2.1\~18.04.20_amd64.deb
sudo dpkg -i libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb
sudo apt-get install -y mongodb-org

follow the steps from the below link
https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/

sudo apt-get install gnupg

echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list

> echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.4.list

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wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -

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> sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10</span>