Hi. I'm trying to get the game to start on linux (ubuntu 18.04). Everything loads just fine in both 32/64-bit versions, but I can't start a game because it doesn't respond to mouse input. I can tab between username/password/world entry boxes but I can't go any further.

Any ideas?

From the terminal, run the game as follows "./Redshift7.x86_64 -screen-fullscreen 0". The game should start up in a window and the mouse should be working as intended. After that, you can go to the options menu and change the screen resolution to your native desktop resolution and  check the box to return to fullscreen mode.