To ensure snap will not be installed again see the apt config here: https://github.com/cies/kubuntu-setup#remove-snap This is needed because an every growing number op packages is "dependant" on it. Here I show how to install Chromium as a DEB package from Debian (on a buntu): https://github.com/cies/kubuntu-setup/tree/master/chromium
Chromium is actually the only real use case for snaps. It is so difficult to build/package chromium for a LTS distro that Debian simply stopped trying. See what happens with security updates on Debian jessie (which is under their LTS): https://security-tracker.debian.org/tracker/source-package/c... . Ubuntu made the right choice here: https://snapcraft.io/blog/chromium-in-ubuntu-deb-to-snap-tra...
I despise the bug, it causes so much trouble without a way to turn it off. Plus the switch to snap happened exactly during a critical vuln which meant people were running on critically vulnerable chromium for weeks.