Allow broken packages to make vbox work

roles/subroles/university.nix

@@ -4,6 +4,8 @@
     zoom-us
   ];
 
+  # TODO: remove this after virtualbox has been fixed in 20.09
+  nixpkgs.config.allowBroken = true;
   virtualisation.virtualbox.host.enable = true;
   users.extraGroups.vboxusers.members = [ "me" ];
 }