ubuntu@ubuntu:~$ sudo mount /dev/sda1 /mnt
Mount is denied because the NTFS volume is already exclusively opened.
The volume may be already mounted, or another software may use it which
could be identified for example by the help of the 'fuser' command.
ubuntu@ubuntu:~$ 
buntu@ubuntu:~$ sudo mount --bind /dev /mnt/dev
mount: mount point /mnt/dev does not exist
ubuntu@ubuntu:~$ sudo mount --bind /proc /mnt/proc
mount: mount point /mnt/proc does not exist
ubuntu@ubuntu:~$ sudo mount --bind /sys /mnt/sys
mount: mount point /mnt/sys does not exist
ubuntu@ubuntu:~$ sudo chroot /mnt
chroot: failed to run command ‘/bin/bash’: No such file or directory
ubuntu@ubuntu:~$ grub-install /dev/sda
Installing for i386-pc platform.
grub-install: error: cannot open directory `/boot/grub/i386-pc': No such file or directory.
ubuntu@ubuntu:~$ update-grub2
grub-mkconfig: You must run this as root