It Depends, Different versions of operating systems uses different amounts of ram,example if you got a Windows computer and it was windows 98 it would use 2mb of ram but if you got a windows xp it would use 128mb of ram to run.
if you were to say out of all well known operating systems and versions hear is a small list:
Order small amount of ram required to largest
Windows 98
Windows 2000
Windows XP
Linux (Ubuntu)
Windows Vista
this is only a basic list so it doesn't have any mac Os's and it doesn't contain all Os's
From David.m
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An operating system manages the working operation of a computer
It uses an android operating system.
Yes, Ubuntu is an operating system, that uses the Linux Kernel.
System software
There is no common operating system amongst video game consoles. Each uses their own operating system developed in-house by the manufacturer.