Same Problem with Kali 2.0

I forgot to take a screeshot But Here's details :

When "Installing System" Finish & when it come to Finishing ans Installing GRUB it show an error ! then i have to choose Continue without GRUB installation !

Then i boot with Live and i found Old Kali files

Now I have to install GRUB

I tried grub-install /dev/sda

it show to me ( grub-install : not found )

i tried apt-get install grub and it works

then i repeat grub-install it show me grub-probe ...

an other error !

Now im using ubuntu !

can i install kali dualboot and install grub from ubuntu ? or something else

please help me ...