how to get the grub screen back

[eightbit]

You have to add

Code:

GRUB_TIMEOUT="10"

To the grub config file. Or you can use Grub Customizer and the GUI will do it for you (change the timeout from 0 to 10)

Code:

sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer