This has been working for me: 1. Processor: Athlon 64 3200+ 2. Release: Ubuntu 5.10 for AMD64 (ubuntu-5.10-install-amd64.iso) 3. Bios Setup: On the "Advanced BIOS Features" set the "APIC Mode" to "Disable" 4. Boot parameters: At the "boot:" prompt pass the following string "linux acpi=off" --AP