apt modernize-sources -y

Thanks for this - I hadn’t seen it yet in the docs I’ve been looking at.
No idea what it does, but it looks legit, so I’ll run it!

Do you run all your services in docker?
Only some of them, but the ones that are installed through apt are from whatever the default repo is, so I hope that will help.
I hadn’t considered that upgrading Docker might be an issue. Hmm. Fingers crossed.