Thank you for contacting Plugable support! Sorry to hear about this issue. I’d be more than happy to assist you.
While we do not officially support Linux it sounds like the dock may just need to be authenticated. Authentication is required for USB devices to operate (this includes the dock Ethernet, audio, and card reader).
Fedora 32 allows for Thunderbolt 3 authentication through the Thunderbolt options in the Gnome Settings (https://fedoramagazine.org/thunderbolt-how-to-use-keyboard-during-boot-time/), non-gnome computers can use bolt/boltd/boltctl commands via the terminal to authenticate.
Please don’t hesitate to let us know of other questions.
Thanks again for contacting Plugable support and best wishes!
Senior Engineer | Product Owner