unattended-upgrades
Just remember to sudo apt-get -y upgrade; sudo apt-get -y dist-upgrade semi-regularly and then
sudo systemctl stop unattended-upgrades
sudo systemctl disable unattended-upgrades
Apport
So I write a short 10-line Python script, and as usual it crashes out with an Exception. Then the Apport crash-reporter window pops up asking me whether I want to inform Ubuntu about the crash. FFS!. So
sudo systemctl stop apport
sudo systemctl disable apport