Can you try to boot ubuntu with acpi disabled?
See the following link for howto do this:
https://help.ubuntu.com/community/BootOptions#Change%20Boot%20Options%20Temporarily%20For%20An%20Existing%20Installation
and add "noacpi" to the boot line. I remember having a similar issue
ages ago but I no longer remember the fix.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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Time runs approx 3x as fast as it should
https://bugs.launchpad.net/bugs/581007
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