I thought I'd disabled software updater's automatic check/download features in the settings so I can just manually do it when I want to, and this works most of the time - but, every once in awhile it'll go off on its own right after I boot up, check for and download the updates without me telling it to, then ask me to install - why does this happen and can I get it to stop? Just want to do updating all myself before I shutdown and no longer need to use the machine.
REASON: very low-end laptop gets locked-up after I boot up when this happens as all its meager resources are maxed out (temps spike) and I can't do anything until it finishes - and you can't tell it's off doing it except for things begin to get choppy, hang, freeze for a bit, etc. and then you'e just stuck :-\
I know - get a better computer, heh, heh...
systemctl disable --now apt-daily{,-upgrade}.{timer,service}
disables the timer and the service so you can still do ot manually. – Fabby Aug 29 '18 at 22:59