Emacs shows "Undefined color : black"

When running Emacs in terminal it shows "Undefined color: black." This might be one of the applications that was broken due to changing from XFree86 to Xorg. To fix this problem define a symlink to the rgb.txt, i.e.,

#: ln -s /etc/X11/rgb.txt /usr/X11R6/lib/rgb.txt

Note that user needs to restart X to apply this changes.

See http://www.ubuntuforums.org/showthread.php?t=90751&page= for the original post.