Thank you for your reply Guilherme. I have decided to try your second
item and install version 4.15.0-43-generic.
Using google I have found the following commands:
sudo apt install
linux-{image,headers,modules,modules-extra}-4.15.0-43-generic
sudo apt-mark hold linux-*-4.15.0-4[45]-generic
su
Ubuntu 18.04.1 LTS Server (GNU/Linux 4.15.0-45-generic x86_64)
"Login Incorrect" repeated four times after entering user name.
"Userspace break as a result of missing patch backport"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813873
three kernels installed 4.15.0.39 4.15.0.44 4.15.0.45-
