Solution 2

Installing the NVIDIA display driver...
A system reboot is required to continue installation. Please reboot then run the installer again.
An attempt has been made to disable Nouveau.
If this message persists after reboot, please see the display driver log file at /var/log/nvidia-installer.log for more information.

1. Check if the Nouveau drivers are loaded. The Nouveau drivers are loaded if the following command prints anything

lsmod | grep nouveau

2. Create a file at /etc/modprobe.d/blacklist-nouveau.conf with the following contents:

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blacklist nouveau
options nouveau modeset=0

3. Regenerate the kernel initramfs:

sudo update-initramfs -u

References

Trying to install CUDA 9.2 on Ubuntu 18.04