I have finally getting to work my ubuntu 18.04 with drivers installed
from additional drivers.

After update from ubuntu 17.10 to 18.04 nvidia-390 drivers were
installed, nvidia-340 package was metapackage for nvidia-390.

Today I was able to install nvidia-340.106 driver directly from
additional drivers, but they unfortunately did not work.

I have described method how to compile nvidia-340.104 for kernel 4.15 in
#114 and this worked without problems.

I did comparison of nvidia-340.104 and nvidia-340.106 and found out that in 
nvidia-340.106 driver has fix for issue between the NVIDIA kernel driver's Page 
Attribute Table (PAT) support and the KPTI page table isolation.
no

After few tries with different kernel settings I have noticed that I
have nopat option enabled in grub kernel boot.

Simple fix for that was to remove nopat option in grub

1. Open grub configuration file /etc/default/grub
# sudo vi /etc/default/grub

or

# sudo nano /etc/default/grub

2. Remove nopat from GRUB_CMDLINE_LINUX_DEFAULT

My current options looks like this:
GRUB_CMDLINE_LINUX_DEFAULT="splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw"

3. Save file and exit editor

4. Update grub configuration

# sudo update-grub2

5. Reboot
# sudo reboot

6. Install recommended drivers
# sudo ubuntu-drivers autoinstall

7. Reboot
# sudo reboot

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https://bugs.launchpad.net/bugs/1752053

Title:
  nvidia-390 fails to boot graphical display

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