Logitech Options for Ubuntu

I don't have the reputation to make comments therefore this "answer" is an answer to @guiverc. I'm not totally sure on how the ergo is working but I have the MX key and MX master 3 and they both have a USB receiver and can also be used with Bluetooth. Logitech states on their danish site that the MX key should have the opportunity to switch among computers:

you just need the Logitech-flow and logitech-options which can be downloaded here: https://www.logitech.com/da-dk/product/options

You don't actually need Logitech Options installed on your linux machine. Just pair your device using the USB dongle or bluetooth (may need a bluetooth dongle if your box doesn't have bluetooth already). I switch my Logitech mouse and keyboard between my Ubuntu box, Windows box, and Macbook Pro using the buttons on the Logitech devices without any problems.

You don't actually need Windows to pair the trackball, ltunify will let you do this on Linux. Just follow the guide on the page (ie. turn off your MX Ergo, run ltunify, turn on the MX Ergo again, done). If you don't want to mess with the user permissions, you can just run ltunify with sudo.

Once you're paired, you can change the settings (HID++ Scrolling and pointer sensitivity) using Solaar.

I just got my MX Ergo in the mail, so can confirm that this process works per the current date :)