let me guess that is a computer that came installed with win8 or at some time has had win8 installed on it... if that is the case you will need the newest vs of Ubuntu or better yet Fedora 18 to get around that issue.
If it truly is nothing but an ACPI issue, then either your BIOS is old and you need to set it to the older type of support (disable acpi) or you have hardware that is not compatible.
please post what unSpawn requested for better help.
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