Upgrade FC11 to FC12 - grub failure

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http://forums.fedoraforum.org – Hi, I would like to please for a urgent help .. I upgraded using preupgrade package. Upgrade was done flawlessly ... but in the and after reboot I found out that Anaconda simply ! did not write into grub.conf ! line for fedora ... There is only line for my dual boot system /// I tried to write the option myself but with no success ... when it started to boot I got message about Kernel Panic ... no root partition should be mounted ... Furthermore Rescue Installed System option of Fedora DVD and this commands: chroot /mnt/sysimage grub-install /dev/sda say everthing was done ... BUT it does NOT generate any grub.conf !!! Has anyone idea what happened ? Or at least, how should look corrrect lines for Fedora in grub.conf exactly ? assuming follwoing disc structure: /xxx - ntfs windows /xxx ntfs windows /boot LVM> > /data > swap > / Please anyone ... Fedora now does not want to let me reinstall because of present packages ... I would have to reinstall if nothing helps :-( (HowTos)