Recommended Minimum System Requirements
The Recommended Minimum System Requirements, here, should allow even someone fairly new to installing Ubuntu or Gnu&Linux to easily install a usable system with enough room to be comfortable. A good "rule of thumb" is that machines that could run XP, Vista, Windows 7 or x86 OS X will almost always be a lot faster with Ubuntu even if they are lower-spec than described below. Simply try Ubuntu CD as a LiveCDfirst to check the hardware works.
Ubuntu is best, but then I'm biased, as my computers all run Ubuntu!
Yes, but it will require ubuntu 8.10
Ubuntu *is* Linux.
All pcs can run Linux. Specifically, you can download and run Ubuntu, which is Linux based. Any PC can run Ubuntu and/or dual-boot Windows and Ubuntu.
No. It is entirely possible to install and run Ubuntu on a computer without ever having run Windows on it.
The Ubuntu Server is used to see how many of one server is being used in a specific area, and is also used as a web server. It shows symbols over places in America and Europe where people use it.
Yes. It is available both in Ubuntu's repository, and from the game's website.
Depending on your hardware, Ubuntu should run on VMWare just fine.
Ubuntu Desktop Edition can be run on both desktops and laptops. Ubuntu has power management features as well.
Ubuntu should run on a Dell Dimension 4600, provided enough RAM is installed. I'm not sure what you mean by "run Windows finally;" Windows is a separate operating system from Ubuntu. One does not typically run operating systems "on" one another.
Ubuntu is binary-compatible with it, so you could technically install and run it. However, a system that old might have problems running Ubuntu well, especially if it doesn't have enough RAM.
Yes.