Na dúvida em seguir algum das maneiras de recuperar o grub volte aqui que a gente ajuda.
voltei galera segui um dos passos mostrado no link (segui o que usa o live CD porque não tinha disket),
e não deu certo, na segunda tentativa eu salvei o passo-a-passo que eu fiz se alguem achar aonde eu errei ou sugerir outra opção eu agradeço
aí está todo passo-a-passo q eu fiz através do terminal na sessão do live CD
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ubuntu@ubuntu:~$ sudo su
root@ubuntu:/home/ubuntu# cd
root@ubuntu:~# fdisk -l
Disco /dev/sda: 40.0 GB, 40060403712 bytes
255 heads, 63 sectors/track, 4870 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Disk identifier: 0xd572d572
Dispositivo Boot Início Fim Blocos Id Sistema
/dev/sda1 * 1 487 3911796 b W95 FAT32
/dev/sda2 488 4870 35206447+ f Win95 (LBA) Partição Extendida
/dev/sda5 488 4870 35206416 7 HPFS ou NTFS
Disco /dev/sdb: 10.2 GB, 10242892800 bytes
255 heads, 63 sectors/track, 1245 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Disk identifier: 0x906f6c68
Dispositivo Boot Início Fim Blocos Id Sistema
/dev/sdb1 1 1186 9526513+ 83 Linux
/dev/sdb2 1187 1245 473917+ 5 Estendida
/dev/sdb5 1187 1245 473886 82 Linux swap / Solaris
root@ubuntu:~# mkdir /mnt/sdb1
root@ubuntu:~# mount /dev/sdb1 /mnt/sdb1/
root@ubuntu:~# chroot /mnt/sdb1/
root@ubuntu:/# ls
bin cdrom etc initrd lib media opt root srv tmp var
boot dev home initrd.img lost+found mnt proc sbin sys usr vmlinuz
root@ubuntu:/# update-grub
Searching for GRUB installation directory ... found: /boot/grub
findfs: Unable to resolve 'UUID=4e70fbea-db37-4ee6-a31a-d96b101ebba3'
Cannot determine root device. Assuming /dev/hda1
This error is probably caused by an invalid /etc/fstab
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 kernel: /boot/vmlinuz-2.6.24-16-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done
root@ubuntu:/# grub-install /dev/
Display all 153 possibilities? (y or n)
root@ubuntu:/# grub-install /dev/s
sequencer smpte0 smpte2 sndstat stdin
shm/ smpte1 smpte3 stderr stdout
root@ubuntu:/# grub-install /dev/s
sequencer smpte0 smpte2 sndstat stdin
shm/ smpte1 smpte3 stderr stdout
root@ubuntu:/# grub-install /dev/sdb1
/dev/sdb1: Not found or not a block device.
root@ubuntu:/# exit
exit
root@ubuntu:~# grub-install /dev/sdb
sdb sdb1 sdb2 sdb5
root@ubuntu:~# grub-install /dev/sdb1
Could not find device for /boot: Not found or not a block device.
root@ubuntu:~# grub-install /dev/sda1
Could not find device for /boot: Not found or not a block device.
root@ubuntu:~#
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valew