roundduckman@devuan-omen-gaming:~$ sudo apt -t ascii-backports install xserver-xorg-video-nvidia python3-pycuda python-pycuda primus nvidia-vulkan-icd nvidia-vulkan-common nvidia-visual-profiler nvidia-vdpau-driver nvidia-smi nvidia-settings nvidia-profiler nvidia-opencl-icd nvidia-opencl-common nvidia-modprobe nvidia-libopencl1 nvidia-kernel-dkms nvidia-kernel-common nvidia-installer-cleanup nvidia-egl-wayland-icd nvidia-egl-wayland-common nvidia-egl-icd nvidia-egl-common nvidia-driver-libs-i386 nvidia-driver-libs nvidia-driver-bin nvidia-driver nvidia-detect nvidia-cuda-toolkit nvidia-cuda-gdb nvidia-cuda-mps nvidia-alternative mate-sensors-applet-nvidia mate-optimus libopengl0-glvnd-nvidia libnvrtc9.1 libnvrtc8.0 libnvidia-glcore libnvidia-encode1 libnvtt-bin
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 nvidia-cuda-toolkit : Depends: nvidia-opencl-dev (= 9.1.85-4~bpo9+1) but it is not going to be installed or
                                opencl-dev
 nvidia-driver-libs-i386:i386 : Depends: nvidia-driver-libs:i386 but it is not going to be installed
 nvidia-visual-profiler : Depends: openjdk-8-jre but it is not going to be installed
 primus : Depends: bumblebee but it is not going to be installed
          Depends: primus-libs (= 0~20150328-4) but it is not going to be installed
          Depends: xserver-xorg-core (>= 2:1.18.3-2) but it is not going to be installed or
                   xserver-xorg-video-intel (>= 2:2.99.917) but it is not going to be installed
          Recommends: primus-libs-ia32
 xserver-xorg-video-nvidia : Depends: xorg-video-abi-23 or
                                      xorg-video-abi-20 but it is not installable or
                                      xorg-video-abi-19 but it is not installable or
                                      xorg-video-abi-18 but it is not installable or
                                      xorg-video-abi-15 but it is not installable or
                                      xorg-video-abi-14 but it is not installable or
                                      xorg-video-abi-13 but it is not installable or
                                      xorg-video-abi-12 but it is not installable or
                                      xorg-video-abi-11 but it is not installable or
                                      xorg-video-abi-10 but it is not installable or
                                      xorg-video-abi-8 but it is not installable or
                                      xorg-video-abi-6.0 but it is not installable
                             Depends: xserver-xorg-core (< 2:1.19.99) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
roundduckman@devuan-omen-gaming:~$ sudo apt -t ascii-backports install xserver-xorg-video-nvidia python3-pycuda python-pycuda primus nvidia-vulkan-icd nvidia-vulkan-common nvidia-visual-profiler nvidia-vdpau-driver nvidia-smi nvidia-settings nvidia-profiler nvidia-opencl-icd nvidia-opencl-common nvidia-modprobe nvidia-libopencl1 nvidia-kernel-dkms nvidia-kernel-common nvidia-installer-cleanup nvidia-egl-wayland-icd nvidia-egl-wayland-common nvidia-egl-icd nvidia-egl-common nvidia-driver-libs-i386 nvidia-driver-libs nvidia-driver-bin nvidia-driver nvidia-detect nvidia-cuda-toolkit nvidia-cuda-gdb nvidia-cuda-mps nvidia-alternative mate-sensors-applet-nvidia mate-optimus libopengl0-glvnd-nvidia libnvrtc9.1 libnvrtc8.0 libnvidia-glcore libnvidia-encode1 libnvtt-bin xserver-xorg-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
xserver-xorg-core is already the newest version (2:1.19.2-1+deb9u2).
xserver-xorg-core set to manually installed.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libopengl0-glvnd-nvidia : Depends: libglvnd0xxx but it is not installable or
                                    glvnd-nvidia-abi-375.20
                           Depends: libglvnd0xxx but it is not installable or
                                    libglvnd0-nvidia (>= 361) but it is not going to be installed
 nvidia-cuda-toolkit : Depends: nvidia-opencl-dev (= 9.1.85-4~bpo9+1) but it is not going to be installed or
                                opencl-dev
 nvidia-driver-libs : Depends: libgl1-nvidia-glvnd-glx (= 390.48-2~bpo9+3) but it is not going to be installed
                      Depends: libegl1-glvnd-nvidia but it is not going to be installed
                      Conflicts: libgl1 (> 0)
                      Conflicts: libgl1-mesa-glx (>= 17) but 17.3.9-1~bpo9+1 is to be installed
                      Conflicts: libglvnd0 (> 0) but 1.0.0+git20180308-2~bpo9+1 is to be installed
                      Conflicts: libglx0 (> 0) but 1.0.0+git20180308-2~bpo9+1 is to be installed
                      Recommends: libgles-nvidia1 (= 390.48-2~bpo9+3) but it is not going to be installed
                      Recommends: libgles-nvidia2 (= 390.48-2~bpo9+3) but it is not going to be installed
 nvidia-driver-libs-i386:i386 : Depends: nvidia-driver-libs:i386 but it is not going to be installed
 nvidia-egl-icd : Depends: libegl1xxx (>= 0.2.999) but it is not installable or
                           libegl1-glvnd-nvidia but it is not going to be installed
 nvidia-visual-profiler : Depends: openjdk-8-jre but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
roundduckman@devuan-omen-gaming:~$