function@function-ThinkPad-T440p:~$ sudo apt-get install nvidia-340 nvidia-prime bumblebee bumblebee-nvidia
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 bumblebee : Depends: bbswitch-dkms or
                      bbswitch-source but it is not installable
             Recommends: virtualgl but it is not installable or
                         primus but it is not going to be installed
 linux-generic : Depends: linux-headers-generic (= 4.4.0.22.23) but 4.4.0.21.22 is to be installed
 nvidia-340 : Depends: dkms but it is not going to be installed
              Depends: lib32gcc1 but it is not going to be installed
              Depends: libc6-i386 but it is not going to be installed
              Depends: xserver-xorg-legacy but it is not going to be installed
              Recommends: nvidia-settings (>= 331.20) but it is not going to be installed
              Recommends: libcuda1-340 but it is not going to be installed
              Recommends: nvidia-opencl-icd-340 but it is not going to be installed
 nvidia-prime : Depends: bbswitch-dkms
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).