Grub (Ubuntu) does not detect Fedora 17

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http://forums.fedoraforum.org – This never happened before. I always dual boot Ubuntu and Fedora and use Grub from Ubuntu. I have just installed Ubuntu 12.04 amd_64. Grub menu does not detect nor list Fedora installation. Fedora 17 grub is installed to its own / partition. Earlier, I had installed Fedora 17 and its Grub to the HD and then went on to install Ubuntu 12.04 and let the installation replace Fedora Grub... like I have been doing in the past. Yet, Ubuntu Grub does not detect Fedora at all. Any help is welcome. (HowTos)