I tried the demo in slackware64-current using open source driver and it worked.
I guess you got an Intel/AMD setup since you need switchlib.
I grabbed the demo form
https://kerbalspaceprogram.com/files...ux.zip.torrent
Unzipped and "chmod +x KSP.x86_64" and then i start the game ./KSP.x86_64
So please post more information and explain what's not working and whats working like if you run it through steam.
I even tried the steam demo from
http://store.steampowered.com/app/220200/
Now the steam demo wouldn't run at first (it hanged at startup with "loading") so i added an launch option LANG=C %command% then it worked as expected.
Tested with amd APU and GPU.