This test is correct because of "/boot/vmlinuz-5.13.0-1002-oem has invalid signature for Secure Boot."
vmlinuz-5.13.0-1002-oem with invalid signature is because it is from ppa:canonical-kernel-team/unstable.
If we use 5.13 kernel from focal-proposed, there should be no such problem.
This test is correct because of "/boot/ vmlinuz- 5.13.0- 1002-oem has invalid signature for Secure Boot." 5.13.0- 1002-oem with invalid signature is because it is from ppa:canonical- kernel- team/unstable.
vmlinuz-
If we use 5.13 kernel from focal-proposed, there should be no such problem.