Command not found - Missing path to /sbin on Debian GNU/Linux - LinuxConfig.org

Starting with Debian 10 buster the way how the su command is used has been changed. By default execution of the su command no longer provides you with expected user environmental variables.
This is a companion discussion topic for the original entry at https://linuxconfig.org/command-not-found-missing-path-to-sbin-on-debian-gnu-linux