Answers for "failed to start mongod.service unit mongod.service not found. ubuntu 20"

Failed to enable unit: Unit file mongod.service does not exist.

> sudo systemctl enable mongodb.service

Failed to start mongod.service: Unit mongod.service not found.

$service mongodb start
$service mongodb status

Failed to enable unit: Unit file mongod.service does not exist.

> systemctl list-unit-files --type=service
...
mongodb.service             disabled
...