Problem with NVIDIA drivers and encrypted partition (dual boot)

I'm trying to install Nvidia drivers on Ubuntu GNOME 16.04 but I have problems when I boot up.

My machine has 2 SSDs:

• First one with Windows 10


• Second one with Ubuntu GNOME 16.04 (on which I boot)

I installed an encrypted Ubuntu with LVM on the SSD.
When I booted everything went fine but after going to "additional drivers", and restarting, I get a black screen.

I tried typing my password to decrypt my partition but nothing happens.

Things I tried:

• CTRL + ALT + F1 (tried to put "nomodeset" into /etc/defaults/grub") but I can't get the prompt.


• I also tried to press "E" when the grub screen appears and to put "nomodeset" after "quiet splash"


• I tried a regular Ubuntu 16.04 and check the disks

My graphic card is a GTX 780.

Is there something I missed ?

Thanks