MongoDB is not installed correctly in Ubuntu 18.04 server - mongodb

Question

Specs: Ubuntu 18.04 Nginx server, Vestacp control panel.
MongoDB was pre-installed in my server, in 3.6.3 version. It was working but I wanted to upgrade it to version 4.4 (current release).
The problem now is that I can't start the mongo service (community edition).
Steps I followed so far:
Stop MongoDB service, Remove packages and remove Data Directories.
sudo service mongod stop
sudo apt-get purge mongodb-org*
sudo rm -r /var/log/mongodb
sudo rm -r /var/lib/mongodb
Trying to install the new version 4.4 the exact steps from the documentation. Below are the commands with an order:
wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -
sudo apt-get install gnupg
wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list
sudo apt-get update
sudo apt-get install -y mongodb-org
echo "mongodb-org hold" | sudo dpkg --set-selections
echo "mongodb-org-server hold" | sudo dpkg --set-selections
echo "mongodb-org-shell hold" | sudo dpkg --set-selections
echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
echo "mongodb-org-tools hold" | sudo dpkg --set-selections
ps --no-headers -o comm 1
sudo systemctl start mongod
sudo systemctl daemon-reload
sudo systemctl enable mongod
mongo
Errors:
sudo apt-get update
It throws an error:
Skipping acquire of configured file 'nginx/binary-i386/Packages' as repository 'http://nginx.org/packages/mainline/ubuntu bionic InRelease' doesn't support architecture 'i386'
On the step:
sudo apt-get install -y mongodb-org
E: Sub-process /usr/bin/dpkg returned an error code (1)
On the step:
sudo systemctl start mongod
Failed to start mongod.service: Unit mongod.service not found.
Directories:
/var/lib/mongodb
and
/var/log/mongodb
are not auto-created after the installation and I can't find them on the above paths.
The port I am trying to begin the server is the default 27017 and I set the rules to ufw.
I am tried to find a solution from similar posts but nothing. I'm stuck for two days now.
Any thought or help?

Answer 1

The problem was in uninstallation of previous MongoDB version 3.6.3.
The command in terminal...
sudo apt-get purge mongodb-org*
...Doesn't uninstall all the packages correctly.
The correct uninstallation was to type in the command line:
sudo apt list --installed | grep mongo
...In order to see if there are any packages left from MongoDB. I had 2 packages left that "purge mongodb-org*" couldn't delete.
So the correct removing executions are the below:
sudo apt remove mongodb
sudo apt purge mongodb
sudo apt autoremove
After that, the installation of the new MongoDB version 4.4 was successfully completed without errors!