I have an Optimus laptop and I frequently add/remove the nvidia-glx-driver-current to enable/disable the Nvidia 960m chip in my laptop. I updated today and I installed nvidia-glx-driver-current and it worked fine. I didn't need it anymore, so I uninstalled it. Later today, I tried to install again, but I just get the blinking black cursor screen. I see there is a new 00-ldm.conf file in /etc/X11/xorg.conf.d but not the /etc/X11/xorg.conf file. I assume this is by design. Besides updating today, I have made no other changes.