If you try install ROSA Fresh on EFI system, this not be able, becouse installer don't knew how doing this. We need add support for install on EFI system. Some investigate for manual installing in this article (Russian only): http://wiki.rosalab.ru/ru/index.php/%D0%A3%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0_ROSA_%D0%BD%D0%B0_EFI/UEFI
*** This bug has been marked as a duplicate of bug 1940 ***