Unpacking grub-pc (from .../grub-pc_1.99-27+deb7u3_i386.deb) ...
Processing triggers for man-db ...
Processing triggers for install-info ...
Setting up grub-common (1.99-27+deb7u3) ...
Setting up grub-pc-bin (1.99-27+deb7u3) ...
Setting up grub2-common (1.99-27+deb7u3) ...
Setting up grub-pc (1.99-27+deb7u3) ...
Generating core.img
Saving menu.lst backup in /boot/grub/menu.lst_backup_by_grub2_postinst
Running update-grub Legacy to hook our core.img in it
    Searching for GRUB installation directory ... found: /boot/grub
    Searching for default file ... found: /boot/grub/default
    Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
    Searching for splash image ... none found, skipping ...
    Found GRUB 2: /boot/grub/core.img
    Found kernel: /boot/vmlinuz-3.2.0-4-686-pae
    Updating /boot/grub/menu.lst ... done

Generating grub.cfg ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-3.2.0-4-686-pae
Found initrd image: /boot/initrd.img-3.2.0-4-686-pae
  No volume groups found
Found Windows Recovery Environment (loader) on /dev/sda2
Found Windows 8 (loader) on /dev/sda4
done

Current status: 279 updates [-2].
sauramon@mordor:~$ os-prober
unshare failed: Operation not permitted
rm: cannot remove `/var/lib/os-prober/labels': Permission denied
sauramon@mordor:~$ sudo os-prober
  No volume groups found
/dev/sda2:Windows Recovery Environment (loader):Windows:chain
/dev/sda4:Windows 8 (loader):Windows1:chain