Just tried Ubuntu 18.04.1 LiveCD. LiveCD starts applications can be executed.
However, after installation of 18.04.1 just the graphical login screen was displayed. I can enter user and password but after pressing enter the login screen always is displayed again and again.
But I could login by terminal (ALT-CTL-F2). So I performed apt-get install nvidia-384.
The command replaced the installed the nouveau driver and installed the nvidia 390-48 driver.
Now I can login on graphical login screen without problems.
Just tried Ubuntu 18.04.1 LiveCD. LiveCD starts applications can be executed.
However, after installation of 18.04.1 just the graphical login screen was displayed. I can enter user and password but after pressing enter the login screen always is displayed again and again.
But I could login by terminal (ALT-CTL-F2). So I performed apt-get install nvidia-384.
The command replaced the installed the nouveau driver and installed the nvidia 390-48 driver.
Now I can login on graphical login screen without problems.