there is no "linux operating system". linux is merely a kernel that operating systems can be built upon, of which there are dozens if not hundreds
Ubuntu is a "distro" of the Linux operating system.
Windows 8 is the most current windows client operating system.
Currently the latest version of Mac OS X is 10.5.8
The current version is Apple Mac OSX Lion
One of the best examples of Open Source Operating Systems is Linux. It is based on the UNIX operating system, is used by most major banks, has a level of security based on over 40 years of experience, and depending on which version or distro you get its free.
The current version of Apple's operating system is Mac OS X 10.7 (Lion).
I guess windows 7 is the latest version of operating system in MICROSOFT.
Yes, each version of "Windows" is an operating system.
iPad runs on iOS. Go to the update section. Here you can see the current version of your OS.
OS not supported means that the software does not work with your current operating system. You may be able to update your operating system to the latest version or you may have to buy a new version of the operating system. If the latter you need to ensure that your computer is going to be able to handle the new operating system as older computers will have a slower processor, less memory etc. which may not suffice.
It's neither. Linux is its own family of operating systems. It is modeled after Unix and shares many design goals, but it is not completely inter-operable. Also, to be legally called a "version of Unix", an operating system must go through a rigorous and expensive certification test, which no Linux distro has currently done. No. Linux is not an *anything* Unix.
A Linux distribution, known as distro or flavor, is an operating system that uses the Linux Kernel. I think the most common one is Ubuntu.