It is clearly specified in grub.cfg
#
# DO NOT EDIT THIS FILE
#
to modify grub you've to edit /etc/default/grub then run update-grub.
This is the entry for 12.04 from the grub you've posted:
Found Ubuntu 12.04 LTS (12.04) on /dev/sda3
All the others are Lucid kernels.
If you want to try to restore grub you've got to.
start a live session, then in terminal
sudo mount /dev/sda1 /mnt
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
sudo chroot /mnt
update-grub
grub-instal /dev/sda
exit
sudo umount /mnt/dev
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/
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https://bugs.launchpad.net/bugs/991558

Title:
  12.04 does not boot after upgrade on Ideapad Y530

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