Having successfully installed Ubuntu 18.04 using "nomodeset" at the grub -

I updated Ubuntu and then installed the graphic driver -

NVIDIA Corporation: G84M [GeForce 8600M GT]


[x] Using NVIDIA binary driver - version 340.107 from nvidia-340 (proprietary, tested)


following the instructions posted here:

https://itsfoss.com/fix-ubuntu-freezing/

Ubuntu is now permanently stuck at startup -

[ OK ] Started Disk Manager.

As I have no idea how to best request help, I've just set up a new topic with the subject directly addressing the problem. My apologies if it's "bad practice"? Thanks very much for any help!

From everything I've read, the problem seems to have been solved for the same card on PCs - so maybe Apple introduces some additional issues? Possibly a proprietary version of the card just for Apple? I have no clue?