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

Question

I follow all the steps mention in MongoDB installation documents for Ubuntu 16.04.

Steps 1:

sudo apt-key adv --keyserv         


        

Answer 1

The following steps helped me solve the problem of not being able to start mongodb on Ubuntu Server 18.04 LTS

Step 1: First, remove MongoDB from previous if installed:

sudo apt remove --autoremove mongodb-org

Step 2: Remove any mongodb repo list files:

sudo rm /etc/apt/sources.list.d/mongodb*.list
sudo apt update

Step 3: Import the public key used by the package management system:

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4

Step 4: Create a list file for MongoDB:

echo "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.0.list

Step 5: Reload local package database:

sudo apt-get update

Step 6: Install the MongoDB packages:

sudo apt-get install -y mongodb-org

Step 7: Start MongoDB:

sudo service mongod start

Step 8: Begin using MongoDB:

mongo

Hope it helps you.