During network install, I select the PLIP driver, and
ask it to autoprobe. The installer returns to the
"autoprobe" screen, so I select autoprobe again. Everything
is fine from then on.
On the kernel messages console, I see that the first time
I asked for the autoprobe, the parport modules loaded, and
the second time the plip module itself loaded.
This issue has been forwarded to a developer for further review.