This is still a bug in the latest updates for Debian 10. I just installed Debian 10, and it's interesting that /usr/sbin isn't in the path unless you use the following command to switch to the root user:
su - Switching to the root user using the commands below doesn't produce a $PATH environment variable with the /sbin and /usr/sbin paths in it. su root su What gives? This is ridiculous. Did anyone even test Debian 10 before releasing? How embarrassing. All variants should work and produce the same $PATH.