So after upgrading to 1.12.1, the Update Modules tab tells me

Updates of Backdrop CMS core using the web interface are disabled.

I had to go googling and then searching the code to figure out why I was getting that - turns out I have to manually update the installer.settings.json file. Shouldn't that be in the release notes?

 

Accepted answer

Sorry, this was user error.

Comments

Sorry, this was user error.

For any future users looking how to turn on manual (or automatic -- in the future) core updates via the UI, look in admin/reports/updates/settings (Reports > Available Updates > Settings) at the bottom of the page.

Self-updates