try to fully uninstall mongod

1-sudo systemctl stop mongod
2-sudo apt-get purge mongodb
3-sudo yum remove mongodb
4-sudo rm -r /var/lib/mongodb
5-sudo rm -r /etc/mongod.conf

and then install with these commends

1-sudo su be super user
2-wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add - add new key
3-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 add mongo to storage
4-sudo apt update sudo apt install -y mongodb-org install latest version
5-sudo systemctl start mongod sudo systemctl enable mongod run and add auto start
I hope it helps you
share your experience with me :)