Try these steps:
$ sudo apt-get purge nvidia* # remove current installed nvidia software including drivers
$ sudo ubuntu-drivers devices # verify it sees your graphics card
$ sudo ubuntu-drivers autoinstall # install drivers automatically
$ sudo reboot
This is everything I ended up doing which eventually fixed it for me:
# Update repo
sudo apt update
# Remove amdgpu drivers
sudo apt purge xserver-xorg-video-amdgpu
sudo apt purge libdrm-amdgpu*
sudo apt purge libdrm-amdgpu1
# Blacklist the amdgpu driver since we are using nvidia only
echo "blacklist amdgpu" | sudo tee -a /etc/modprobe.d/blacklist.conf
# Remove nvidia driver and install from system76 repo
sudo apt purge *nvidia*
sudo apt-add-repository -y ppa:system76-dev/stable
sudo apt install -y system76-driver-nvidia
sudo apt upgrade -y
sudo reboot
Step four, you want to pull the fluid column up to unstick the trash, so go slow ‘down’ and somewhat more forceful on the ‘up’.