Comment 17 for bug 365642

Vargnatt, have you tried to NOT change the language defaults that WUBI presents you? I mean, if your copy of windows is in Hungarian, Wubi should default in Hungarian, so don't change the language and try to install. You will have your new Kubuntu in Hungarian, but you will be able to change the language after the installation...

From what I've experienced, the error happens when you change the default language (see previous post), but everything just worked OK when I left the default.