Couldn't connect to server 127.0.0.1:27017 connection attempt failed MongoDB

Question

I am working on Ubuntu OS 16.04. I am starting mongodb using commands:: sudo service mongod start and then mongo

It generated this error for m

Answer 1

mongod --repair worked for me ,

sudo mongod --repair
sudo mongod

Then open a different tab/terminal:

mongo

After this your local setup will work properly