Hi, all. I can confirm that the problem described (at least the
manifestation I experienced) is still an issue with the 7.10 x86
standard graphical installer, which I downloaded on 2/28/2008. I ran
into the problem on a system with multiple hard disks, all containing
preexisting filesystems, all of which were mounted when I originally
tried to run the installer. I documented everything I did to get the
installer to progress past 15% here:
http://ubuntuforums.org/showthread.php?p=4429985#post4429985

Many related bugs suggest kernel problems, but I actually found partman
to be the likely culprit, specifically
/lib/partman/commit.d/01unmount_busy, which I had to kill (after
unmounting all filesystems) in order to get the installer to continue.
The installer *did*, however, pick back up essentially where it left off
and completed without another hitch. What I'm not sure of is whether
partman's "busy" script is hanging because ubiquity didn't do a good
enough job of prompting the user and/or unmounting partitions before
launching partman, or whether there's something wrong with the script
causing it to hang in some circumstances.

What tipped me off about '01unmount_busy' was the fact that it was
consuming over 60% of the CPU, presumably waiting for the partition I
was installing to (which was mounted at the time) to become free. I
didn't really have the opportunity to digest what was going on inside
the script, but it was definitely solely responsible for the lockup at
15% in my case.

-- 
Edgy RC freezes at instalation in Sony Vaio vgn-s5hp
https://bugs.launchpad.net/bugs/67723
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