I have a fresh install of Jessie GNOME 64 bit since the release date. I've never had a single notification of any available system update. So, as a daily routine I run 'apt-get update' and 'apt-upgrade'.
Google suggests that this bug was resolved in Jessie. However, even after updating to Jessie 8.3 recently, I still do not have any notifications. When (just out of curiosity) I run GNOME Package Updater (or whatever it is called) it reports "All packages up to date" but running apt-get right after brings new updates, as it was today. I tried all suggestions found on Google, like using 'dconf-editor' to tweak the 'Shell update plugin' settings, etc., but without any results. I do not care about GNOME Package Updater and other GUI things, since I still prefer CLI. However, notifications would be nice to have as a reminder. Anyone to suggest something helpful? Thanks.