Solve problem: Monitor not working with Ubuntu

MonitorNotWorkingUbuntu.txt

After connect HDMI cable, the monitor was working with Windows System, but not working on Linux (I run dual boot on a Acer Predator)
My GPU is an RTX2060 and I also have Intel onboard card installed. 

So I tried to check GPU nvidia driver and card status. In the Additional Drivers tab it was not showing any information. I tried to run
a lot of commands such as:
nvidia-settings
nvidia-smi
prime-select
xrandr
bumblubee

At last, I could realize that GPU driver was not being opened bu bumblubee. Than I found this post:
https://askubuntu.com/questions/902636/nvidia-smi-command-not-found-ubuntu-16-04
And tried the first solution

sudo apt purge nvidia-*
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt install nvidia-381

After add the repository i could not install the driver suggested (nvidia-381). Then I checked again on Additional Drivers tab on Software & Updates
and it was showing fresh drivers, including 510 and 470. I then tried 510 but got error. Tried 470 it worked. It also asked
a password to disable secure boot in order to install the driver. 
When I reboot the system it showed a screen to enroll MOK. At first I continued boot, but then I did the same process again and choose
enroll MOK, put the password and it worked, finally.