Make sure that all non-grsec kernels are purged duing install on Focal

[kushaldas]

Description

This is blocked on #5507. We have to make sure that no non-grsec kernel is installed on the Focal system.

Steps to Reproduce

• molecule converge -s libvirt-staging-focal

Expected Behavior

The command should finish properly.

Actual Behavior

The step for purging all non-grsec kernels will fail as it booted into 5.4.x series kernel (default in Focal).

Comments

Suggestions to fix, any other relevant information.

[conorsch]

This is blocked on #5507.

Not so sure... the tasks I'm seeing failing during installation are #5495 and then the assertions that all kernels were removed. At least in libvirt VMs, I'm running a grsec kernel as expected, and removing the other automatically installed kernels is possible if I update the patterns. Haven't tested on hardware (nor on Qubes, in which the staging VMs are created directly from the Ubuntu ISOs), but #5507 can track that follow-up.