Secure Boot dbx Failed to build error issue

[Forpli]

At the moment there is a problem with the ubuntu server. Try it later.

Upstream Ubuntu server error

This is certainly upstream of Zorin, but I imagine the Zorin brothers know who to contact far better than I do. For ~1 hour at least, attempting to update, whether by the Software Updater or APT has failed. The software updater returns a poorly advised instruction to check Internet connection. APT returns that us.archive.ubuntu.com/ubuntu is returning HTTP 500 (internal server error, and why "check your Internet connection" is poorly advised). I have run apt update (several times), and the i…