Many versions of Linux have been ported to the Macintosh, but were not initially developed for the Mac. Ubuntu falls into this category. There are some PC features that do not exist on the Mac, and some Mac features that lack support under Ubuntu.

“Everything is a file in Linux” is an oft repeated statement. What this basically implies is that all the devices (Hard disks,CD ROMs, Floppy Disks, USB Sticks,etc) are all treated as files.