Comment 10 for bug 183426

I experienced this as well. It took ages to do the "Starting the partition manager" or whatever it says, and I ended up closing it, killing all processes by it, and then starting it again. It did not quite work, and then I noticed that it kept complaining about /dev/sdd using a size of something of 2048. I then remembered I had my iPod plugged in. Unplugging it and restarting the installer helped me.

The installer did seem to have some problems though. I had to shut it down a few times and start it again as it kept hanging on the screen where I choose the language to use for the install.