Uninstall mongodb correctly and install mongodb again - mongodb

Question

Please teach me how to uninstall my mongodb in my virtualbox(ubuntu).
I tried these command and nothing was removed :
sudo apt-get purge mongodb mongodb-clients mongodb-server mongodb-dev
sudo apt-get purge mongodb-10gen
sudo apt-get autoremove
It still exists.
I type mongod --version it shows db version v2.6.1
Update:
I want to remove it and then install it again:
I tried the following 4 commands -
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list
sudo apt-get update
sudo apt-get install mongodb-org
then
sudo service mongod start
and type mongo there is error:
MongoDB shell version: 2.6.4
connecting to: test
2014-09-02T21:27:10.390+0800 warning: Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2014-09-02T21:27:10.392+0800 Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at src/mongo/shell/mongo.js:146
exception: connect failed
Did I miss something?
Please help me. Thank you!!

Answer 1

Normally, with apt command, you can launch autoremove with all mongoDB packages :
sudo apt-get autoremove mongodb-*
Ok on the mongodb documentation, the packages are changed. To have an up-to-date package follow instructions :
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
Create the /etc/apt/sources.list.d/mongodb.list list file using the following command:
echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list
Issue the following command to reload the local package database:
sudo apt-get update
And install desired packages :
sudo apt-get install mongodb-org
After that you have server, shell, mongos, ... To launch mongodb-server youcan launch the mongodb service like this :
sudo service mongod start
To connect on your local server just enter this command :
mongo

Answer 2

To remove Mongo run these commands below
sudo apt-get purge mongodb
sudo rm -r /var/log/mongodb
sudo rm -r /var/lib/mongodb
If you have different versions of mongo already installed, Run the command below
sudo apt-get autoremove
To install mongo safely in Ubuntu 18.04 first update all packages by running this command
sudo apt update
Now install mongo
sudo apt install -y mongodb
Start mongo by running command below
sudo systemctl start mongodb
Now check mongodb status by running
sudo systemctl status mongodb
It should show a status Active
I hope this works for you thanks