The following are the system requirements for Ubuntu as of the 9.10 release:
Any type of computer will support Ubuntu as long as the computer has met the requirements such as memory. You must have at least 3gb's of storage.
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.
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.