Yesterday in the WINDOW7 operating system will be a free space into a disk, the result of the start today, found that the boot interface can not enter, resulting in the Windows7 and BACKTRACK5 operating system I can not get in, and finally found a solution in the Linux community
First step: Find out where the Ubuntu partition and grub directory are located.
If you remember the best, forget it doesn't matter, use the following command to test each one.
Grub RESCUE>LS Carriage Return
List all disks and partitions on this machine, such as: hd0, (hd0,1)
, (hd0,4), (hd0,7), (hd0,8), (hd0,9), etc.
Loop through the following command until the contents of the partition are displayed instead of "Unknown filesystem"
Grub Rescue>ls (hd0,0)/grub carriage return
Let's say that when we try to (hd0,8), the content is displayed successfully.
Grub Rescue>set root= (hd0,8) carriage return//bracket the partition that was attempted successfully in the previous step
Grub Rescue>set prefix= (hd0,8)/boot/grub carriage return
Grub Rescue>insmod Normal Carriage return
Grub>normal Carriage return
At this point, you should quit the Grub rescue mode and get into the familiar grub mode
Step Fifth: Fix grub
After entering the backtrack system, sudo update-grub carriage return in the command line
Complete, enter reboot reboot, then select the system you enter