First try to fsck the partition. It cannot be mounted. So if you see it in Places, right click and select "unmount". Or from a terminal, run (assuming sda2 is the Ubuntu partition)
Code:
sudo umount /dev/sda2
Then perform an fsck check with this:
Code:
sudo e2fsck -f -y -v /dev/sda2
Once you have run the check, you might also accomplish this before rebooting. Mount your Ubuntu partition again, then reinstall grub:
Code:
sudo mount /dev/sda2 /mnt
sudo grub-install --root-directory=/mnt /dev/sda
Reboot and if you are still having difficulties, boot the LiveCD and completely purge then reinstall G2 using the chroot procedures in this guide:
HOWTO: Purge and Reinstall Grub 2 from the Live CD
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