Fedora Install kill Grub2 LVM dual boot

[moocan]

Dear All,

I had a notebook with Ubuntu 11.10 and Fedora 15 with dual boot and following LVM disk configuration on /dev/sda (80 Gb):

/dev/sda1			/boot		100Mb
/dev/sda2 (vg_ubuntu)
/dev/vg_ubuntu/UbuVol00		/		20Gb
/dev/vg_ubuntu/UbuVol01		/home		9Gb
/dev/sda3 (vg_fedora)
/dev/vg_fedora/FedVol00		/		20Gb
/dev/vg_fedora/FedVol01		/home		9Gb
/dev/sda4			swap		10Gb

I decide to upgrade to Fedora 16 using LiveCD and Fedora kill my Ubuntu grub2 dual boot.

I have restored a simple grub2 using Ubuntu alternate CD and can boot to ubuntu but impossible to restore grub on /dev/sda1 boot partition.
One time I only have a grub shell prompt at boot and sometimes nothing.
I have now many grub, grub2, boot, boot/grub, with many grub.cfg on /dev/sda1.

Can I format /dev/sda1 partition and reinstall grub2 for LVM dual boot ?
Must I have to reinstall all my systems ?
Does fedora provide any … if grub already installed then add menu entry or upgrade ?

Is there any tool to reinstall correctly grub2 with dual boot using Fedora ?
Is there any way to install Fedora without killing previously installed and working grub2 configuration ?

if someone could provide me some advices and/or steps to do it

Kind Regards

[RHamel]

Did you try

sudo update-grub