Good call… the output of dpkg -l | grep -i nvidia is
ii  bbswitch-dkms                              0.8-3ubuntu1                                 amd64        Interface for toggling the power on NVIDIA Optimus video cards
rc  nvidia-384                                 384.90-0ubuntu0.16.04.1                      amd64        NVIDIA binary driver - version 384.90
hi  nvidia-410                                 410.78-0ubuntu0~gpu16.04.1                   amd64        NVIDIA binary driver - version 410.78
rc  nvidia-opencl-icd-384                      384.90-0ubuntu0.16.04.1                      amd64        NVIDIA OpenCL ICD
ii  nvidia-prime                               0.8.2                                        amd64        Tools to enable NVIDIA's Prime
ii  nvidia-settings                            384.81-0ubuntu1                              amd64        Tool for configuring the NVIDIA graphics driver

very odd. so it seems the old driver (384) is still around. What do you think the best way to fix this is?
About secure boot: I don’t think I changed the bootloader, and I am not running dualboot…