adding fedora 15 to mint 12 grub menu

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http://www.linuxquestions.org – I have added mint 12 on Pc running fedora 15(on different partitions),I cant find fedora on the grub menu I ve tried mounting the fedora partition to run update-grub but ,I cant mount the device am getting this error (unknown filesystem type 'LVM2_member')any help (HowTos)