Cannot set Chrome as Default Browser - Lubuntu 20.04

Solution 1:

This answer is just Gabriel's found on the Lubuntu discourse site

Configuring x-www-browser in Alternatives, XDG's default-web-browser and Lubuntu's default internet browser application in Session Settings is not enough. Turns out Chrome looks at /etc/xdg/xdg-Lubuntu/mimeapps.list and you have to edit it as sudo and replace the instances of the "firefox" string with your browser of choice.

Hope I've been of some help.

Thanks should go to Gabriel (printfgabriel)