Developers, this bug is possibly related to bug 310808 which this user also filed. Again, also please check bug 309519 as a possible duplicate (same symptom, different hardware).
m45smg, I was going to ask you to try acpi=off as well, but according to bug 310808, Ubuntu fails to boot with this option. Thank you for providing the other information I requested. I will also mark this bug as Triaged so a developer can have a look at it. In the meantime, can you please double check that you tried the options "noapic nolapic" as written (they are not typos, APIC is not ACPI) - you mentioned "nolacpi" which is not a valid boot option, and "noacpi" is not the same as "noapic".
Developers, this bug is possibly related to bug 310808 which this user also filed. Again, also please check bug 309519 as a possible duplicate (same symptom, different hardware).
m45smg, I was going to ask you to try acpi=off as well, but according to bug 310808, Ubuntu fails to boot with this option. Thank you for providing the other information I requested. I will also mark this bug as Triaged so a developer can have a look at it. In the meantime, can you please double check that you tried the options "noapic nolapic" as written (they are not typos, APIC is not ACPI) - you mentioned "nolacpi" which is not a valid boot option, and "noacpi" is not the same as "noapic".
Thanks again.