I'm trying to install and use nvidia drivers on my ubuntu 16.04 install (asus k401, nvidia geforce 940M).
When I install them they prompt me for disabling secure boot: I enter the password, reboot, get the password prompt and select disable secure boot, it reboots with "booting in insecure mode" in top left corner.
Everything looked fine, except the driver doesn't seem to work and
mokutil --sb-state tells me secure boot is still enabled.
When I try to reinstall nvidia drivers I get prompted again, saying that secure boot is enabled and I need to disable it.
I have full disk encryption activated, if that may play a role...
How can I debug this issue further?