Good Afternoon!
I am on Ubuntu Linux 20.04. My game dev team is using Unity 2019.4.11f1. That version is no longer available in the Unity Hub. I went to the Unity Archive like the Unity Hub suggested to find the older versions of Unity. (Download Archive). The page has direct download links for Windows and Mac but nothing for Linux. It does have the xdg-open link.
- That is failing silently when I try the link in Chrome.
- When I try it in Fire Fox it tells me the link is unrecognized.
- I tried just copying the xdg-open link and running it in Bash but it just gives me an error saying “The specified location is not supported”
dave@laptop: xdg-open unityhub://2019.4.11f1/2d9804dddde7gio: unityhub://2019.4.11f1/2d9804dddde7: The specified location is not supported
I think this is happening because the Unity Hub is now an app image and it does not get registered in any type of config file so things like xdg-open can’t work. I am trying to figure out how to do that but the guides I am finding haven’t been very helpful yet.
Am I on the right track here? Any pro tips would be very welcome… I opened a ticket with Unity support but the automated response warned me it might take 10 business days to get even the first response sent back to me. 
Best,
David
Brooks