First of all, sorry about the "unprofessional way" of asking this question on this website. I'll keep editing and updating this description.
I'm a newcomer to Ubuntu, so my question might be a bit naive. I'll stay with my computer for the entire day and watch the notification from this website. Let me know if you want any other information (and best to tell me HOWTO, I appreciate it).
What I am doing is I want to install a second system on my Laptop, it was with Win10, now it's Win10 + Ubuntu 16.04. After a painful day I success, so I then want to install the close-sourced NVIDIA driver for it. But I failed for more than 10 times and everytime I need to reinstall my Ubuntu...
Many tutorials and blogs points out I need to blacklist the default nouveau driver, and shutdown the X server to install the NVIDIA driver. However, if I do so:
(1) After I blacklist the default driver, I basically can never return to my GUI after a reboot. I can see the grub page and select Ubuntu, then all I have is a blank/black screen.
(2) If I shutdown the X server, I immediately enter a black screen. Every blog posts told me to press Ctrl+Alt+F1, but I tried F1 to F6 there but nothing happens.
(3) When I was on my Ubuntu desktop, if I press Ctrl+Alt+F1, my mouse gone but the GUI left (however, even with keyboard I cannot type anything, looks like a frozen computer.) and I cannot do anything with it. But if I press Ctrl+Alt+F7, my mouse comes back and everything is fine.
Please please let me know if you want any other information from me. BTW, I have read at least 5 posts about this issue and tried every upvoted answer on ASKUBUNTU and none of them can help with my case.
For example,
Why does switching to the tty give me a blank screen?
UPDATE 1:
After shutting down the X server, the system is still running but with a black screen, as I can ssh to it from another computer. I've also tried to use ssh to complete the task but that points out why I am asking this question. I blacklist the nouveau driver, then I reboot. And after I select Ubuntu from GRUB, I just have a black screen. I cannot ssh to it. And I cannot use tty by Ctrl+Alt+F1. If I can enter the CMD mode then the problem can be solved.