Reinstall the boot menu that configures Ubuntu

1. View partition hangs in case, find Ubuntu where the partition (boot) $sudo fdisk-l

2. Unmount the disk partition (boot) of the Isodevice mirror device

   $sudo umount-l/isodevice

3. Mount Ubuntu partition (boot) to MNT (here/dev/sda or SDB ...) Depending on where you installed the Ubuntu HDD ... or different types of hard drives will be other indicators)

   $ sudo mount-l/dev/sdax//mnt

4. Install Grub (/DEV/SDA is the first hard drive, if you install on another hard drive may be sdb ... or different types of hard drives will be other indicators)

   $sudo Grub-install--root-directory=/mnt Space/dev/sda

5. Reboot to see if it has gone back to the previous Ubuntu boot menu and of course your Windows menu is also in it

Reinstall the boot menu that configures Ubuntu