partman calls update-dev which in turn calls udevtrigger and udevsettle,
which, according to keybuk, causes udev to reload the sound card
modules.  HAL's database gets updated and pulseaudio is told about the
new card, which in turn plays a sound on it, presumably to signal that
it works.

Calling udevtrigger and udevsettle makes sense on the alternate CD,
where it needs to manually trigger updates, but the live CD is running
udevd, so this is unnecessary as I understand it.  We should therefore
modify /bin/update-dev to do nothing, as part of ubiquity's build
system.

Colin, does this sound reasonable to you?

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[Hardy] Login sound plays during install
https://bugs.launchpad.net/bugs/178057
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