How can I stop the Software Updater from nagging me to restart?

  • Launch dconf editor the way you want, maybe Dash
  • Click Ctrl+F and search for hide-reboot-notification and click next

enter image description here

  • Click the checkbox and you are done!!!

dconf-editor on Trusty doesn't have a hide-reboot-notifications option, but adding one with the following command appears to work:

dconf write /com/ubuntu/update-notifier/hide-reboot-notifications true

I tried using gsettings set but it complained that the key didn't exist. So far dconf write has stopped the reminder appearing, and the setting is now visible in dconf-editor.