lubuntu@lubuntu:~$ sudo grub-install --boot-directory /mnt/boot/ --target=i386-pc /dev/sda
Installing for i386-pc platform.
grub-install: warning: Sector 32 is already in use by the program `FlexNet'; avoiding it.  This software may cause boot or other problems in future.  Please ask its authors not to store data in the boot track.
Installation finished. No error reported