So I'm using Kubuntu 17.04 and it was working perfectly until I upgraded Nvidia from v.381 to v.384. The grub automatically uses kernel 4.10.0-32 to boot and after the "kubuntu splash screen" (before boot - the one with kubuntu logo and glowing light behind it) it only shows a blinking cursor ( _ ). when I try to boot with 4.10.0-19 it boot to Kubuntu and every thing works fine. I tried and uninstalled all Nvidia packages and the problem didn't occur again. so I reproduced the bug with installing the 384 again and the now the same thing happens, so I'm pretty sure it has something to do with the kernel version. if anyone has any solutions to this I'd really appreciate it.
[ also I'm not an expert in Linux and have been using it for a few months. ]