Login Loop after installing 390.25 on Ubuntu 18.04

I have a Titan V and have installed the driver nvidia-390.25 on Ubuntu 18.04.
I use nvidia-smi can show the information of Titan V. However, when I use nvidia-xconfig and reboot, the login Loop appears. I can not solve it.
Here is the URL of my bug report.
http://paste.ubuntu.com/p/YcQpYx3cmJ/

Don’t use the .run installer, please remove the driver using the --uninstall option, then use the ubuntu graphics ppa to install the latest driver.
https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa

I have tried.

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update

But it showed me like that.

Hit:1 http://us.archive.ubuntu.com/ubuntu bionic InRelease          
Ign:2 http://ppa.launchpad.net/bumblebee/stable/ubuntu bionic InRelease        
Hit:3 http://security.ubuntu.com/ubuntu bionic-security InRelease              
Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease             
Hit:5 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease           
Ign:6 http://ppa.launchpad.net/bumblebee/testing/ubuntu bionic InRelease
Hit:7 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease
Err:8 http://ppa.launchpad.net/bumblebee/stable/ubuntu bionic Release         
  404  Not Found [IP: 91.189.95.83 80]
Err:9 http://ppa.launchpad.net/bumblebee/testing/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/bumblebee/stable/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/bumblebee/testing/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Is it the problem that the Titan V is new and there is no driver support on Ubuntu?
Or the problem of Ubuntu.

There are two kinds of graphics cards in the server, integrated graphics card and Titan V. I want to use Titan V to display. So I typed the command nvidia-xconfig and reboot. However, the login loop appear.

The Titan V is well supported.
The errors you’re seeing are from the bumblebee ppa, unrelated. In case you installed bumblebee, uninstall it.
Install the driver:
sudo apt install nvidia-driver-410

See if you can disable the integrated gpu in bios.

Yeah, it worked. But I can not open the nvidia-settings to use the Titan V.
It showed that.

ERROR: Unable to load info from any available system

nvidia-smi can show the information of the GPU. But nvidia-settings can not work.

nvidia-xconfig show that.

good@AirSim:~$ sudo nvidia-xconfig
[sudo] password for good: 

WARNING: Unable to locate/open X configuration file.

Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
New X configuration file written to '/etc/X11/xorg.conf'

Please create and attach a new nvidia-bug-report.log. Hovering the mouse over an existing post of yours will reveal a paperclip icon.