I observe the same behavior as described: even when "Automatically check for updates" it set to "Never" in "Software & Updates" I periodically get prompts about updates to install. This on Jammy and with update-notifier 3.192.54.
(User story: I update manually often enough, and I normally run the devel release, so I prefer to chose the moment when to install updates. The notification isn't really useful in my case.)
I observe the same behavior as described: even when "Automatically check for updates" it set to "Never" in "Software & Updates" I periodically get prompts about updates to install. This on Jammy and with update-notifier 3.192.54.
(User story: I update manually often enough, and I normally run the devel release, so I prefer to chose the moment when to install updates. The notification isn't really useful in my case.)