First, download the standard set of MIBs using
sudo apt -y install snmp-mibs-downloader
This will download all available MIBS files during package installation but if at any time you want to download/update them, use
sudo download-mibs
After that, you’ll need to activate loading the MIBS for the SNMP client (original source for this command: @CameronSparr on medium.com):
sudo sed -i 's/mibs :/# mibs :/g' /etc/snmp/snmp.conf