Comment 0 for bug 1996892

[ Impact ]

 * Kernels have a set of builtin trusted and revoked certificates as a bundle
 * It is not very easy to access them, one needs to either download linux kernel package source code; or boot the kernel look up builtin hashes; and then find certificates externally
 * It would be more convenient for inspection to expose these in the buildinfo package, which already exposes auxiliary kernel information

[ Test Plan ]

 * sudo apt install linux-buildinfo-$(uname -r)
 * check that /usr/lib/linux/$(uname -r)/canonical-certs.pem exists and contains livepatch cert
 * check that /usr/lib/linux/$(uname -r)/canonical-uefi-2012-all.pem exists and contains 2012 cert

[ Where problems could occur ]

 * buildinfo is an auxiliary package not installed by default, but used by developer tooling and packaging.