I'm late to the party, but hoping to help others solve this problem as I have today. I'm running Ubuntu v20, which did not support Logitech MX Ergo rigt away. Despite seeing in bluetooth list, I could not pair. I found this link that i can't post because this is my first post (forum rules) You can google Ubuntu Lomoco for more info, but basically executing
Code:
sudo apt install lomoco
, then restarting will enable you to pair the MX Ergo.