Docker package install on Ubuntu Focal base image fails

I am using actions to build docker images.
When I use Ubuntu Focal base images, my package fails to install.
When I use Ubuntu Bionic base images, all is well.
But when I build on my local Debian/Proxmox system I can successfully install on Focal.
The issue seems to be related to building using actions on the GitHub Linux image, which I believe is Focal.

Build script:

Failing build:

Revert to Bionic good build:

Any ideas?

Hmm, seems my testing was incomplete, I can make it fail outside of Actions.
Problem is caused by sysctl: setting key "kernel.core_pattern": Read-only file system on Focal.


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