Did you try starting the hub in a terminal and see what it says?
Vanessa is based on Ubuntu 22.04. This version of Ubuntu has a newer version of LibSSL that is not compatible with Unity. If only the Unity devs would distribute Unity as a Flatpak then this kind of compatibility issue would not exist but they don’t want to for some reasons. Until then you can check the other thread on this forum that explains how to run Unity on Ubuntu 22.04. This will apply to Mint Vanessa as well.