apt --fix-broken install

apt-get install libgl1-nvidia-glx:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 gcc-6-multilib : Depends: libc6-dev-i386 (>= 2.11) but it is not going to be installed
 libc6-dev-x32 : Depends: libc6-dev-i386 (= 2.24-10) but it is not going to be installed
 libgl1-glvnd-nvidia-glx : Conflicts: libgl1-nvidia-glx:i386 but 375.39-1 is to be installed
 libgl1-nvidia-glx:i386 : Depends: libnvidia-glcore:i386 (= 375.39-1) but it is not going to be installed
                          Depends: libx11-6:i386 but it is not going to be installed
                          Depends: libxext6:i386 but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

dpkg --purge --force-depends "package name"

dpkg --purge --force-depends "gcc-multilib"