It sounds like the Nvidia driver is not happy with the new kernel.
Please try booting an older kernel or forcefully reinstalling the Nvidia kernel driver:
sudo apt install --reinstall nvidia-driver-390 nvidia-dkms-390
and then reboot (because the Nvidia web site tells me your GPU is only supported by driver version 390).
You can also find other kernels to test at https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D
It sounds like the Nvidia driver is not happy with the new kernel.
Please try booting an older kernel or forcefully reinstalling the Nvidia kernel driver:
sudo apt install --reinstall nvidia-driver-390 nvidia-dkms-390
and then reboot (because the Nvidia web site tells me your GPU is only supported by driver version 390).
You can also find other kernels to test at https:/ /kernel. ubuntu. com/~kernel- ppa/mainline/ ?C=M;O= D