I installed ubuntu-desktop package (the GNOME env.) on my Kubuntu so, that I could have GNOME and KDE together (for any demos).

I installed compiz, that is three packages compiz compiz-gnome compiz-kde

I also installed Xserver-xgl; (since Xgl is a pre-requisite for Compiz).

only if you are using proprietary drivers....AFAIK.

According to the documents on Ubuntu's help website

(http://help.ubuntu.com) I wrote a small script

#!/bin/bash compiz --replace gconf & gtk-window-decorator --replace

and put this file in /usr/local/bin/ and assigned it executable permissions. For GNOME, I added the necessary lines in /etc/gdm/gdm.conf-custom

That is the following lines [servers] 0=Xgl

[server-Xgl] name=Xgl server command=/usr/bin/Xgl -fullscreen -br -accel xv:pbuffer -accel glx:pbuffer flexible=true

Also, added Compiz to start by default using "Sessions" in GNOME.

However, I'm not able to see any effects (not even the basic ones) and I *guess* Compiz isn't even starting up!

Am I missing something here? Are there any additional steps?

Was the command you gave for starting Compiz during startup compiz --replace .If yes.it's correct.

I also tried enabling compiz in KDE, but there's just

one problem. There's a small line change in /etc/kde3/kdm/kdmrc ServerCmd=(all that content)

And then at a command line (when I assume Xgl is enabled after a log-off and log-in) I issue the following command

kdm --replace=compiz

What happens after this is that each window's title bar disappears, also disabling any keyboard input :-/

I have tried searching quite a few documents. Most of them speak only about GNOME, and most are about NVIDIA and ATI cards.

My video card is a SiS 650 and I have shared 32 MB of my Physical RAM to it.

Dunno about the card.Try google.I searched "SiS 650 Compiz-Fusion Ubuntu 6.06" and found an italian wordpress blog page translated by google.I think that would be of some use to you.

Regards, Easwar