Does Linux Support X?

Yes. Linux uses XFree86 (the current version is 4.0, which is based on
X11R6). You need to have a video card which is supported by XFree86.
See the XFree86 HOWTO for more details. Most Linux distributions
nowadays come with an X installation. However, you can install or
upgrade your own, from "ftp://metalab.unc.edu/pub/Linux/X11/Xfree86-*"
and its mirror sites, or from http://www.xfree86.org/.