[Bug 480086] Re: Karmic 32-bit kernel only recognizes 3GB with 4GB in the machine

[Przemysław Kulczycki]

This looks like a hardware issue.
See the comments in the link that you've posted.
One of them recommends updating BIOS.

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Karmic 32-bit kernel only recognizes 3GB with 4GB in the machine
https://bugs.launchpad.net/bugs/480086
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