Thanks million for the help.
I've been using linux for years, but mostly with server application, not desktop
thus, graphic was not a requirement until today ;
my T61 has windows XP pre-installed. I loaded ubuntu 8.04 to have dual boot. Kinda testing things out before migrating to linux ubuntu. So far, it worked for MATLAB, mathematica, LATEX, JAVA, etc etc
I ran into problem by the way 
before posting this topic, I tried many methods, include adding SKIP_CHECK=yes to compiz_manager. Wondering if it will cause problem for this method.
thanks again
Code:
khoa@khoa-laptop:~$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xce90d8983e731f79
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com 0xce90d8983e731f79
gpg: requesting key 3E731F79 from hkp server keyserver.ubuntu.com
gpg: keyserver timed out
gpg: keyserver receive failed: keyserver error
Code:
khoa@khoa-laptop:~$ sudo apt-get install xserver-xorg-video-intel-2.4
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
xserver-xorg-video-intel-2.4: Depends: libdrm2 (>= 2.3.1) but 2.3.0-4ubuntu1 is to be installed
Depends: libpciaccess0 (>= 0.8.0+git20071002) but it is not going to be installed
Depends: xserver-xorg-core (>= 2:1.5.99.901) but 2:1.4.1~git20080131-1ubuntu9.2 is to be installed
E: Broken packages
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