I am sorry, I don't have an active linux installation to debug the build - it was just a shot into the blue with the unity-build function.
Ah. I think I have a suspicion as to what's wrong - I think I might be missing a package. I'll investigate - pretty sure it's on my end.
Fixed that first error, but can't seem to shake that last "Unable to preload the following plugins: ScreenSelector.so" error - hrm.