Comment 46 for bug 1684240

For people that do not need the external GPU, they could disable it and only use the integrated Intel driver, after fixing a bug that causes non-booting.

In case anyone needs it, here's what I did, after installing the nvidia-384 driver:
    # Install bumblebee
    apt install bumblebee
    # Add my user to bumblebee group
    gpasswd -a user bumblebee
    # Switch to the intel card
    prime-select intel
    # Add to the grub kernel line: acpi_rev_override=1
    sudo vim /etc/default/grub && sudo update-grub

    # Followed steps 3, 4, 5 from these instructions: http://www.webupd8.org/2016/08/how-to-install-and-configure-bumblebee.html
    # If you need the ext card and it doesn't work, try various steps from https://wiki.archlinux.org/index.php/bumblebee#Installation to enable it