Comment 27 for bug 875343

I had this problem when installing 14.04 desktop amd64.

I had configured LVM as per
http://ubuntuforums.org/showthread.php?t=1782296
and had not marked any partitions apart from /boot for formatting (because I'd already formatted them with mkfs.ext4)

It did warn me that it would overwrite any system directories like /etc, /lib etc - which is no problem. But it hung at the "Saving installed packages..." step.

I rebooted and told the installer to format all partitions, and then it was OK.