I suggest looking at https://wiki.ubuntu.com/DebuggingACPI, starting
with:
Try booting with the "acpi=off" kernel parameter
* This will disable ACPI support. If the error is the same with
acpi enabled and disabled, this may not be an ACPI issue.
--
getting "ACPI Invalid PBLK Length 5" - message on Hardy Alpha 5
https://bugs.launchpad.net/bugs/197267
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