@Colin, OK thanks for the info. FYI on the one broken upgrade to 10.10 I updated the wubildr and regenerated grub.cfg but it then gave me a different error: invalid mode.
I still think it's worthwhile to put in some sort of workaround to preventing problems for wubi installs to a different partition until a real fix can be delivered e.g. overwriting the MBR. Even if it can't fix the wubildr update issue.
@Colin, OK thanks for the info. FYI on the one broken upgrade to 10.10 I updated the wubildr and regenerated grub.cfg but it then gave me a different error: invalid mode.
I still think it's worthwhile to put in some sort of workaround to preventing problems for wubi installs to a different partition until a real fix can be delivered e.g. overwriting the MBR. Even if it can't fix the wubildr update issue.