An important system upgrade did not download

[Ponce-De-Leon]

Ah, yes. The Secure Boot Thing. This is at the Moment a common Problem. Here is a Way to solve it:

Secure Boot dbx Failed to build error issue

After spending some time researching this issue further, we've identified and created a potential solution for it with the standard fwupd package (APT). However, it would need to be tested more thoroughly to ensure that it fully resolves the issue and doesn't introduce any regressions that would affect the stability of the system in general. How to test the solution If you're still experiencing this issue – even after following the steps I mentioned in this post – and you're happy to test pre-p…