I've been struggling with a fresh 16.04 desktop install on PC with Nvidia GTX 950. Initial install is fine. Only thing is in Nouveau my 4k monitor only goes up to full hd resolution. After I install proprietary driver from Nvidia (I've tried 361 through screen and 364 trhough ppa) and reboot PC it freezes right after Grub. With 361 on black screen with blinking cursor , with 364 on either black or purple screen without cursor. Either way it's not booting. With 361 I did get to boot a couple of intermittent times and it dit show 4k resolution but it only booted like one in 20 attempts.
I've tried everything I could find like nomodeset, different clock settings, bios settings, more than 10 fresh reinstalls with different options etc but cannot find a working model.
My 14.04LTS setup with proprietary Nvidia drivers works fine on this PC :-S
Can anybody help me find what is wrong?