Bug#627163: Workaround
As I had this issue too I read somewhere that somebody solved it by
removing his iPod from the USB port. So I went through the
installation process and when it hung I aquired a shell and killed all
partman processes. Then removed the USB stick which contains the
Debian CD. I went to "Partition disks" again and it complained the "CD
Rom" was missing. I clicked "no" twice and finally got the option to
partition manually.
That was a success. But the next step to install the base system
failed as the CD Rom was gone. Mounting via shell didn't work, so I
issued a "udevadm trigger" and went to the point to mount the install
medium again. From there the installation went through.
So it seems the installer has problems with USB devices which are
"disk volumes".
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