I have Acer Aspire 5024WLMi and have had the same problem.
Try adding "noapic" to kernel boot options (in LILO/GRUB).
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Unconfirmed => Confirmed
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APIC error on CPU0: 40(40)
https://launchpad.net/malone/bugs/37576