Shorcut to insert bullet point • into text in Linux (Ubuntu 18.04LTS)

One way is to define a compose key. Then you can do:

Compose followed by . followed by = => •

This page lists characters you can type in Gtk using a compose key:

https://help.ubuntu.com/community/GtkComposeTable

Type Shift+Ctrl+U followed by 2022. As you type you will see a u followed by the digits, underlined, where you're typing. Then hit Enter. The underlined expression should become a bullet point.

Full list of Unicode characters don't ask me why, the value 2022 isn't there for the typographical bullet but it works

EDIT: see comments below to understand why I'm leaving this non-answer here.