How to fix errors caused by DigitalOcean's broken MariaDB links?

Trying to run “sudo apt-get update” / “sudo apt-get upgrade”, and it’s failing because all these links like this return 404:

Where can I find these files, and how can I tell my update/upgrade commands to point to the correct URLs?


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I’m beginning to suspect it’s not just DO’s mirrors… this MariaDB URL is also currently 404: