Nope, 32 bit apps can't address 4GB RAM - It's nothing to do with Ubuntu
The 32-bit version only seems to support about 3.5GB out of the box (I'm > sure it's tweak > able to run with more). > > I'd say if you have less than 4GB memory, stick with 32-bit, especially > if you want to use things like the Adobe Flash Plugin. > >
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