Hmm just tried like you showed but the menu options don't even highlight when mouse is hovered over them. It might just be a problem with the Linux build?
Viewing post in How to run the game?
I booted up Ubuntu 14.04 LTS to try this out and did not experience any issues. What OS are you using? To reiterate, you just have to enter something in the name & password fields and click login, then enter a world name and click choose world, you can then start the game by clicking the single player button.
It is probably better to show you. Note that nothing on screen is clickable, I have to use Tab to highlight text fields and Alt+F4 to close. This is on Debian 9.
Thanks for the video. I believe I have a solution for you. From the terminal, run the game as follows "./Redshift7.x86_64 -screen-fullscreen 0". The game should start up in a window and the menu should be working as intended. After that, go to the options menu and change the screen resolution to your native desktop resolution. You can then check the fullscreen box to return to fullscreen mode and the menu buttons should continue working. This is apparently an issue with the game engine as you can see here: https://forum.unity.com/threads/fullscreen-gui-bug.338181/page-2 and here: https://forum.unity.com/threads/ui-not-receiving-mouse-events-5-6-0f1.464107/pag.... I was able to reproduce the problem in Debian 9 with Oracle VM and the above solution worked for me. I hope this helps. Thank you for your patience. If you need any info about other command line arguments such as -screen-fullscreen 0, all the information is here: https://docs.unity3d.com/Manual/CommandLineArguments.html