I wrote:
> It hangs at
>
> ACPI: setting ELCR to 0200 (from 0c00)
>
> If I boot with "nolapic" it continues. ("noapic" doesn't work.)
>
> So it's probably a kernel problem.
Well. The installer uses the kernel 2.6.21-2-486. In another VirtualBox I
installed the etch installer, upgraded to sid, and installed the same
2.6.21-2-486 kernel from testing, and it booted without a problem. So it's
not only a kernel problem after all.