Hey Linuxgurugamer, was told I should contact you on the forums to inform you of an error I found today, and someone else ran into shortly afterwards.
I was having problems where I could not actually add anything to build in RO+RP1. I could simulate, add the building plan, but nothing would ever actually start building. Hitting "build" or "launch" did nothing, but did produce this in the console:
Found this error, looked in my game directory, and there was nothing related to SpaceTux so, found the github at https://github.com/linuxgurugamer/SpaceTuxLibrary/releases and manually added to my gamedata relaunched game, and now KCT is working and I can add to build.
Wanted to post my solution in-case it helps anyone else, or if there is a current issue with the CKAN installation/setup that is skipping SpaceTuxLibrary (i did a complete fresh install following the instructions today, perhaps I missed something in there that discussed this, or may need to be added?)