Comment 11 for bug 313452

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Xnyper (matt-rixman) wrote : Re: Jaunty, Karmic: when booting from one partition and installing to another, installer fails to unmount '/cdrom' this halts installation.

Found a workaround thanks to this guy:
http://jaredforsyth.com/content/unetbootin-failed-unmount-cdrom

I just opened up a terminal window and ran:
sudo umount -l -r -f /cdrom

I did this right after the "Who are you" window, before the "Installing System" window.