Apologies. Deepest even.
Before anyone needs to chastise me I looked it up and OS X is more Next and other sources than Linux per se.
Apparently Parallels on OS X will run Win and Lin, but the underlying OS is OS X and does not imply that ArcGIS would be stably emulated by a Linux machine emulating Win.
Sorry.
Hope not to have too terribly offended in my ignorance.
Colin