Re: Not my way?
1) You may find you have security updates set to automatically install re:unattended-upgr?
2) You may be pointing at alternative (country based?) repositories that have not been updated as yet.
I hope its 1.
https://www.cyberciti.biz/faq/how-to-set-up-automatic-updates-for-ubuntu-linux-18-04/ may help you go full tonto on it.