Well, I tried the CLI, and got an entirely different error. Yay?

Error: Module version mismatch. Expected 46, got 50.
    at Error (native)
    at Object.Module._extensions..node (module.js:435:18)
    at Module.load (module.js:344:32)
    at Function.Module._load (module.js:301:12)
    at Module.require (module.js:354:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/home/angle/.steam/steamapps/common/Screeps/server/modules/backend/greenworks/greenworks.js:22:18)
    at Module._compile (module.js:410:26)
    at Object.Module._extensions..js (module.js:417:10)
    at Module.load (module.js:344:32)

I'm right-clicking and launching through steam. Do I need to use the CLI?

I too already have libstdc++6 and am getting said error. How do I rebuild to fix it?