after the release of 12.04, I tried to install Ubuntu on my laptop (Windows 7 Home, 4GB Ram, T6600, >80 GB free space on C) via wubi (downloaded from here: Windows installer for Ubuntu Desktop). Previous experiences with 10.04 - 11.10 have always been positive.
After the download however, when presented with the installation dialog, the only option to pick when it comes to the DE is "Lubuntu", but I want to install Ubuntu. On startup, Wubi identifies itself as "Ubuntu Installer for Windows"; when started it displays "Lubuntu Installation Programme" in the window title. Several test with wubi versions on the current Ubuntu CD as well as the Xubuntu CD yielded exactly the same result.
Fairly excessive googling has found nothing of interest for this issue.