"Wubi as included on the ISO images is unable to enter its second stage of installation, so you will not be able to install inside Windows using just an ISO image in this beta release. As a workaround, users who are installing the Ubuntu Desktop Edition can download the stand-alone version of wubi from http://releases.ubuntu.com/10.04/wubi.exe which includes the fix for this bug. This bug will be fully addressed for 10.04 LTS Beta 2. (541607)"
Ezt épp most találtam, talán ez lehet a gond?
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http://infszabopeter.blogspot.com