You don't need more memory than 3GB unless you're running multiple programs with heavy memory usage which isn't too likely on ubuntu. With 1GB of memory on my laptop the usage never has gone past 55%, even with multiple apps open across 3 different virtual desktops.
Another great reason to delete vista which took 85% with 2 open apps with the same laptop. Essentially, you don't need that much memory. Yet.
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