Comment 31 for bug 259540

Installing Wubi on some raid setups seem to work fine. Others not. This is not likely a Wubi issue - maybe Ubiquity?
In some cases, there is raid metadata present even if there is no raid in use. This also seems to confuse things.
Another issue can be the mixture of GPT and MBR partition table data. Again, likely Ubiquity problem.

You cannot install on Windows 7 dynamic disks - because some of these are not in the partition table at all. Windows 7 actually rejects that within the Wubi install (Windows part) when you try and add a boot manager entry to BCD that refers to a dynamic disk. I believe it should work on any partition that is in the MBR (e.g. the partition for C:), but I would think it's dangerous to have C: mounted as a single partition in Ubuntu, whereas in Windows it's actually a number of separate dynamic partitions.

There are probably other causes of this error as well.

In general I recommend running the bootinfoscript ( http://bootinfoscript.sourceforge.net/ ) - see what it reports in terms of raid info, and it's fdisk output should show any leftover GPT information causing conflict.

But since these errors are being generated out of Ubiquity that's probably the project that needs to included. However since the bug is around since 2008 with no fix - and since there may be many separate problems with the same symptom, it's better to identify what your problem is and then create a new ubiquity bug for it.