I asked before but could not solve it, I gave it some time, I tried again and I still have problems starting MongoDB. I removed it from my Ubuntu 18.04 computer and am re-installing it based on the documentation of the mongo, after installed when I start the following message appears
Failed to start mongod.service: Unit mongod.service not found.
If the service does not exist, then you create it
1: Save the file as mongodb.service in the following PATH: /etc/systemd/system/mongodb.service;
[Unit]
Description = High-performance, schema-free document-oriented database
After = network.target
[Service]
User = mongodb
ExecStart = / usr / bin / mongod --quiet --config /etc/mongod.conf
[Install]
WantedBy = multi-user.target
2: Try to run again [sudo] systemctl start mongodb
Most likely the mongodb.service drive is masked. Use the following command to unmask.
sudo systemctl unmask mongodb
and run again
sudo service mongod start