Steps to Downgrade MongoDB on Ubuntu (for UniFi Controller)

This is an example for downgrading from MongoDB version 3.6 to version 3.4 in Ubuntu 18.04 LTS, but it can be adapted for any combination of versions.

Remove old versions. Since this was done for a compatibility issue with UniFI Controller, the first step is optional

sudo apt-get remove unifi
sudo apt-get remove mongo*
sudo apt-get autoremove

Install MongoDB v3.4 Community Edition using the guide below. They also provide guides specific to other versions that you may need.

If you are doing this for UniFi Controller (optional), download latest controller package for Ubuntu

Install it (optional)

sudo dpkg -i unifi_sysvinit_all.deb

Fix any broken packages

apt --fix-broken install



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