Disable auto checking update on ubuntu
https://askubuntu.com/questions/1059971/disable-updates-from-command-line-in-ubuntu-16-04#1065679
sudo systemctl disable --now apt-daily{,-upgrade}.{timer,service}
Remove snap
https://askubuntu.com/a/1114686
TL;DR:
sudo rm -rf /var/cache/snapd/
sudo apt autoremove --purge snapd gnome-software-plugin-snap
rm -fr ~/snap
This will completely remove snap, snapd, all installed snap packages and their data, and never again suggest snap packages in the software store.
Your output of mount, df and cat /proc/partitions will thank you ;)
UPDATE:
After successfully uninstalling snapd, make sure that it doesn’t get installed again:
sudo apt-mark hold snapd
Optionally test that the block works by trying to install the chromium-browser, which (at the time of writing) suddenly depends on the snapd and will drag everything just uninstalled back into your system upon installation:
sudo apt-get install chromium-browser
The installation should fail.