MongoDB Community Server Installation Issue

I am trying to install MongoDB as per instructions provided in their documentation.

I am getting this error and I am unable to resolve this issue. Any help in this regards will be highly appreciated:

The commands I am running are as under:

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

For Ubuntu 18 LTS:

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

And Then:

 sudo apt-get update

And Then:

sudo apt-get install -y mongodb-org

After running above mentioned command i get this error:

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed: libcurl4 mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
The following NEW packages will be installed: libcurl4 mongodb-org mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/56.0 MB of archives.
After this operation, 241 MB of additional disk space will be used.
dpkg: unrecoverable fatal error, aborting: unknown user 'mongodb' in statoverride file
E: Sub-process /usr/bin/dpkg returned an error code (2)

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