As a daily user of Ubuntu, I have few complaints.  With that said, however, the X window system is… dated.  It’s pretty much rock solid out of the box, is fairly well maintained, and has few issues in my experience.

Mark Shuttleworth of Canonical/Ubuntu sees X being replaced by a “younger” display server called Wayland, possibly as soon as Ubuntu 11.10.

Wayland is based on GL, which means the eye-candy we’re used to seeing in other OS’s will be easy to implement, out of the box, in Ubuntu.

More details here:

http://digitizor.com/2010/11/05/ubuntu-to-ditch-x-for-wayland/

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