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Why does Ubuntu only show 3GB of RAM?

I changed my laptop RAM and went from 3GB to 4GB. Ubuntu still sees only 3GB, but the BIOS confirms 4096 MB installed. How do I get Ubuntu to recognize the added 1GB?

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marked as duplicate by Jorge Castro, John S Gruber, Mik, Mitch, maythux Oct 11 '12 at 5:27

This question was marked as an exact duplicate of an existing question.

Hello, and welcome to AskUbuntu. Unfortunately, for us to help you, you need to elaborate some more on your question. For instance what is the version (32 or 64 bits) of your operating system? And if it is 32bits, does your Ubuntu Kernel have PAE enabled? – NlightNFotis Oct 10 '12 at 21:39
Could you please post the output from: sudo dmidecode -t memory. – BuZZ-dEE Oct 10 '12 at 21:45

You would need to be running 64 bit kernel, or at lease the pae 32 bit version. Please give the output of the following:

uname -a
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