Solution is here:
http://samiux.wordpress.com/2008/01/10/how-to-use-4-gb-ram-on-a-32-bit-ubuntu/
SUMMARY: use the -server kernel, not -generic one.
Please somebody check out this bug... It's not like nobody has 4 GB of RAM in 2008. (not only servers)
Solution is here:
http:// samiux. wordpress. com/2008/ 01/10/how- to-use- 4-gb-ram- on-a-32- bit-ubuntu/
SUMMARY: use the -server kernel, not -generic one.
Please somebody check out this bug... It's not like nobody has 4 GB of RAM in 2008. (not only servers)