how to install mongodb on ubuntu 16.04.1?

Question

I have used the instructions from the docs

after this command:

sudo apt-get install -y mongodb-org

I get this warning:

WARNING: The following packages cannot be authenticated!
  mongodb-org-shell mongodb-org-server mongodb-org-mongos mongodb-org-tools mongodb-org
E: There were unauthenticated packages and -y was used without --allow-unauthenticated

Its instruction to start and test gives the following:

sudo service mongod start

cat /var/log/mongodb/mongod.log
cat: /var/log/mongodb/mongod.log: No such file or directory

Answer 1

As I mentioned in the comment, you could solve the problem by bypassing the gpg signature checks of apt using :

sudo apt-get --allow-unauthenticated install -y mongodb-org 

You might want to have a look at more configuration options in detail along with right practices of using this appraoch here : https://askubuntu.com/questions/74345/how-do-i-bypass-ignore-the-gpg-signature-checks-of-apt

Answer 2

The mongodb docs have a great page on installing the latest mongo on Ubuntu. You can find it at: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/

I'd recommend uninstalling mongodb and following the instructions on the previously mentioned page.