Problem solved. I updated to the Linux4.15.3-0 kernel and all is working again. While looking for information I stumbled across the “Ukuu Kernel Update Utility”, which allowed me to update the kernel automatically. It worked well for me.
If anyone is interested here are some links;
http://ubuntuhandbook.org/index.php/2017/02/ukuu-install-latest-kernels-ubuntu-linux-mint/
another variation:
http://ubuntuhandbook.org/index.php/2018/08/uktool-tool-to-install-latest-kernels-ubuntu/