I've just installed a Intel DG35EC motherboard with an Intel Core 2 Duo E8400 
3GHz processor and 4GB RAM now running Linux las 2.6.28-11-server #42-Ubuntu 
SMP Fri Apr 17 02:48:10 UTC 2009 i686 GNU/Linux.
I was puzzled by the fact that only 3GB of memory was usable with the desktop 
9.04 system.  I "googled" and found this  page.  I also found the page at 
http://www.cyberciti.biz/faq/ubuntu-linux-4gb-ram-limitation-solution/.  After 
a little more reading, I followed the instructions on the cyberciti.biz site.  
Installing the server kernel worked for me.  

~$ free -m
             total       used       free     shared    buffers     cached
Mem:          4015        396       3619          0         15        132
-/+ buffers/cache:        248       3767
Swap:         3867          0       3867

I'm too new at this to understand any caveats of using the server kernel on a 
desktop system, but I'm happy that I can utilize all of the memory that I paid 
for.  I will be using this system for testing VMware and Virtualbox to try to 
get sco openserver 5.0.6 to run on newer hardware(wish me luck).
This should be fixed for the desktop install, as well.  I'm just glad I could 
find a fix on the net and the server kernel works!
-Alex

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Ubuntu kernel doesn't support >=4GB memory
https://bugs.launchpad.net/bugs/74179
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