I am getting real sick of this popup window which has to pop up every single effing day.
It moves focus from whatever I am working on. If I cancel it, it will popup again in a few hours. If I install the update, there will be new one the next day.
Perhaps, I do not want to disable it altogether. It would be nice for a notification every month or so.
Ubuntu 18.04.3 LTS
For the sake of completeness. Turns out it's called ukuu.
And under Settings, there is an option to change notification frequency.