[chimerax-users] ChimeraX 1.5rc running on Nvidia RTX Titan [ubuntu 22.04]

Dear, I recently installed a Nvidia RTX Titan GPU card, and ChimeraX 1.5rc, it is a bit wired. I can open the window using intergrated GPU but if I just clicked on Chimerax or try to open it in terminal, it failed to open the program... Is ChimeraX only working on integrated GPU? Also, I cannot install the chimerax using apt install as in the website description, but dpkg -i works... is this the right way to install? many thanks! Hong