I noticed my Ubuntu box only had 3.2GB of RAM the other day when I was using RStudio for something. I was a little shocked. I went to the Ubuntu site which says it installs the PAE enabled kernel by default, but it clearly had not done so. The fix was easy enough:
sudo sudo apt-get install linux-headers-server linux-image-server linux-server
Then reboot and now I have 3.9 GB. I recently upgrade a windows laptop to Ubuntu 10.04 and it did install the PAE support just fine. I'm not sure why mine was not enabled, but its worth a 30 sec check to find out if you are using all your memory.
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