Getting access to the Board Manager on Ubuntu

How do you access the Board Manager in Arduino on Ubuntu? It is not listed in my Arduino version!

I am running v1.8.3 (which runs as v2.1.0.5), and have need to install a custom board (ESP32).

Does anyone know how to resolve this?

justinmreina:
I am running v1.8.3 (which runs as v2.1.0.5)

No, you have 2:1.0.5+dfsg2 or whatever they call that outdated, non-standard thing you get from apt-get. That is not 1.8.3! You need to download 1.8.3 from http://www.arduino.cc/en/Main/Software.

The reason why the Linux package managers have a 3.5 year old version of the IDE is explained here: