Problem with GRUB and UPDATE MANAGER

[hosemaria at poczta.onet.pl]

Hi to all
I am new to UBUNTU and hava a problem with GRUB.
After UPDATE MANAGER update some stuff my boot menu change in such a way
that I don't have any UBUNTU in menu.
Only WINDOWS 7, WINDOWS VISTA, memtest.
I mounted ubuntu partiton to LIVE CD and checked boot dir and there is only
grub dir
and memtest86+.bin

no vmlinuz files.
I tried to edit boot/grub/grub.conf but i cannot hava a permition.
I 've also tried sudo update-grub2
but what i get is:
grub-probe: error: cannot find a device for /.

Any ideas?
Greetings
Michael
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