I'm ubuntu 9.10 user after he last using I 've lost my boot loader , now i can't use neither linux or widows.
who can help me what should I do ?

I don't know what you've done exactly (maybe you can explain: re-install a distro, or only shut down you computer and it was like that?)

but is it possible to boot the live-cd and repair the bootloader (reinstall GRUB(2?) - maybe have a look on the ubuntu-site / forum:
reinstall GRUB2

or post here the output of the following command (I hope the file is there) after you booted into ubuntu with the live-cd
cat /boot/grub/grub.cfg

What u did ?
U can use ubuntu live cd to get in ,or u have to recover ur grub by reinstalling grub menu.

hi
I've done all the stages in reinstall GRUB2 but nothing have happened.
still I cant use my linux
I've also run this command:
cat /boot/grub/grub.cfg
I got this error : error in output/input
or by running grub-setup command i see this message:
try grub-setup --help (i've examined all the options )

I think I'm going to have the same problem when I reboot the next time. I'm not comfortable with what my aptitude upgrade did to grub.

In any case, a workaround would be to install another distro (like Ubuntu 8.04) if you have free disk space. If you don't have free disk space you can boot a gparted cd and squeeze a little space from another partition. When you install the other distro, it will most likely find your 9.10 install and add an entry into it's WORKING grub. If not, just run fdisk -l and see what partition 9.10 resides on, mount it temporarily and see what kernel/ initrd.img files you'll need to stick in the menu.lst or what ever config file this distro uses.

The other option is to boot a recovery disk and install lilo. It still exists on 8.04.

Jim.

this has happened to me too

Only solution I can come up with was to use a livecd with grub 1, install grub1 to hdd mbr
convert grub.conf to menu.lst for grub1 and edit menu.lst
then reboot into reg grub menu.lst

boot your buntu install and at desktop open a terminal, become root and do

or

if that doesnt work first purge grub and grub-pc
with

itll complain but make it purge the grub-pc configs too

then do

it should install to mbr, update
and then just reboot

most time I use this with grub1 grub legacy

say I wanna install grub to sda1
first mount sda1 if you can
if mounted on /media/disk
that should work

unfortunately none of these solutions could help me , nothing had happened. I want to reinstall both os (windows & ubuntu) but my windows can't recognize the hard disk. how can i format my hard by linux

The format option is part of the install on the Ubuntu CD