What version do you have? It's OK here.
$ dpkg -L xorg-common | g rgb.txt /etc/X11/rgb.txt /usr/X11R6/lib/X11/rgb.txt $ apt-show-versions -p xorg-common xorg-common/unknown uptodate 6.8.2-10
What version do you have? It's OK here.
$ dpkg -L xorg-common | g rgb.txt X11/rgb. txt X11R6/lib/ X11/rgb. txt common/ unknown uptodate 6.8.2-10
/etc/
/usr/
$ apt-show-versions -p xorg-common
xorg-