gsettings set org.gnome.software download-updates false seems to mitigate this issue.
https://askubuntu.com/questions/773874/disable-gnome-softwares- notification-bubble-notify-osd-for-available-updates -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-software in Ubuntu. https://bugs.launchpad.net/bugs/1580836 Title: Gnome Software ignores software-properties-gtk "When there are other updates" setting and displays update notification too regularly Status in gnome-software package in Ubuntu: Confirmed Bug description: On Ubuntu 16.04, using gnome-software 3.20.1+git20160426.1.a976144 -ubuntu-xenial-0ubuntu1 software-properties-gtk has a setting for "When there are other updates" besides security updates. Setting this to "Display every two weeks" should prevent all non-security update notifications from bothering the user more often than every two weeks. gnome-software categorizes some non-security updates as "OS Updates" and every day it displays the pop-up message "Software Updates Available Important OS and application updates are ready to be installed." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1580836/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
