bumblebee / primusrun does not work with NVIDIA 375.66

In Ubuntu 16.04.2, after upgrading nvidia-375 to 375.66-0ubuntu0.16.04.1, bumblebee stopped working. Attempting to launch anything with primusrun results in errors.

Upstream bug report seems to be pointing at a flaw in /usr/lib/nvidia-375-prime/ld.so.conf , that's why I'm assigning to nvidia-375 and not bumblebee: https://github.com/Bumblebee-Project/Bumblebee/issues/879

From syslog:

Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 20.414721] [WARN]Unable to disable discrete card.[ 2606.504423] [ERROR][XORG] (EE) /dev/dri/card1: failed to set DRM interface version 1.4: Permission denied
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504433] [WARN][XORG] (WW) "glamoregl" will not be loaded unless you've specified it to be loaded elsewhere.
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504435] [ERROR][XORG] (EE) Failed to load /usr/lib/nvidia-375/xorg/libglx.so: libnvidia-tls.so.375.66: cannot open shared object file: No such file or directory
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504438] [ERROR][XORG] (EE) Failed to load module "glx" (loader failed, 7)
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504441] [WARN][XORG] (WW) Warning, couldn't open module mouse
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504443] [ERROR][XORG] (EE) Failed to load module "mouse" (module does not exist, 0)
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504448] [ERROR][XORG] (EE) NVIDIA(0): Failed to initialize the GLX module; please check in your X
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504451] [ERROR][XORG] (EE) NVIDIA(0): log file that the GLX module has been loaded in your X
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504453] [ERROR][XORG] (EE) NVIDIA(0): server, and that the module is the NVIDIA GLX module. If
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504455] [ERROR][XORG] (EE) NVIDIA(0): you continue to encounter problems, Please try
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504458] [ERROR][XORG] (EE) NVIDIA(0): reinstalling the NVIDIA driver.
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504460] [WARN][XORG] (WW) NVIDIA(0): Unable to get display device for DPI computation.
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504464] [WARN][XORG] (WW) Warning, couldn't open module mouse
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504465] [ERROR][XORG] (EE) Failed to load module "mouse" (module does not exist, 0)
Jun 27 01:08:54 ubuntu1604 bumblebeed[892]: [ 2606.504470] [ERROR][XORG] (EE) /dev/dri/card1: failed to set DRM interface version 1.4: Permission denied