Error on startup. Unknown file filesystem grub rescue>. What to do??
 

Yesterday I installed the latest version of ubuntu to my computer that was already running windows 7. I had everything working fine until in windows I deleted a partition that had nothing in it. After this I restarted but I can't get into either OS. I get an error that says
Error: unknown filesystem
grub rescue>

I think I need to fix something in grub. I have been booting off of a usb stick with linux on it in the mean time. I am very new to this and the things I find on the web don't make any sense to me. Can someone please help me??

You pretty much need to reinstall your bootloader and config. Go get the super grub disk and rescue it, and you should be good.

http://www.supergrubdisk.org/

You could boot from ubuntu live cd and then do this:

Boot up ubuntu from the livecd,open terminal and run:
sudo -i
mount /dev/sda7 /mnt
mount /dev/sda6 /mnt/boot #skip this one if not have a separate /boot partition
grub-install --root-directory=/mnt/ /dev/sda



If you miss “grub.cfg” file,use following to recreate:
mount --bind /proc /mnt/proc
mount --bind /dev /mnt/dev
mount --bind /sys /mnt/sys
chroot /mnt update-grub
umount /mnt/sys
umount /mnt/dev
umount /mnt/proc
exit