Comment 21 for bug 757720

Followup on my previous comment:

Given the other comments here, I removed one of my hard drives, leaving me with 4 partitions, 3 ntfs partitions, and one RAW partition that I intended to install ubuntu on. I tried mounting and unmounting the disks, as described by kd4pba, without success. Noticing that I couldn't mount the raw file system when trying to mount, I thought that might be the problem. I formatted the RAW partition with ext4, and ran the installer again. No error! :)