I ran the installer from a Debian live wheezy USB boot; it failed at the same part but I noticed that gparted fails on /dev/sda. See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=705851 for details. It seems likely that is the cause of the failure here. To be clear, I don't know whether the installer uses libparted, but even if it doesn't the underlying issue may affect it.
As a workaround I ran gparted /dev/sdb from the live system and used debootstrap to install. It appears to be working, but I have yet to attempt booting into the new system. I also tried the squeeze installer. It hung at the same point as wheezy's. Ross -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org