Try the Feisty Beta 1 kernel. Your issues are ACPI related. If they persist, then try booting without ACPI, e.g., 'acpi=off'.
** Changed in: linux-source-2.6.20 (Ubuntu)
Importance: Undecided => Low
Assignee: (unassigned) => Ubuntu Kernel Team
Status: Unconfirmed => Confirmed
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USB subsystem crashes after a few minutes
https://launchpad.net/bugs/84049
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