Can't run MongoDB on Ubuntu 16. What to do?

Question

MongoDB

Friends, help!
I just can’t run MongoDB on Ubuntu 16. I’ve been struggling all morning ((( I tried different versions of Mongo. As a result, now it’s like this:

mongo -version
MongoDB shell version v4.0.5
git version: 3739429dd92b92d1b0ab120911a23d50bf03c412
OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
allocator: tcmalloc
modules: none
build environment:
    distmod: ubuntu1604
    distarch: x86_64
    target_arch: x86_64

/etc/systemd/system/mongodb.service

[Unit]
Description=High-performance, schema-free document-oriented database
After=network.target

[Service]
User=mongodb
ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf

[Install]
WantedBy=multi-user.target

but sudo service mongod status
gives:

mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2019-01-22 11:43:31 UTC; 12min ago
     Docs: https://docs.mongodb.org/manual
  Process: 24207 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=1/FAILURE)
 Main PID: 24207 (code=exited, status=1/FAILURE)

Jan 22 11:43:31 mahumach systemd[1]: Started MongoDB Database Server.
Jan 22 11:43:31 mahumach systemd[1]: mongod.service: Main process exited, code=exited, status=1/FAILURE
Jan 22 11:43:31 mahumach systemd[1]: mongod.service: Unit entered failed state.
Jan 22 11:43:31 mahumach systemd[1]: mongod.service: Failed with result 'exit-code'.

Tell me what to do! Thanks in advance!