[SOLVED] Installing "which" on Ubuntu 18.04.4

Googling for the "which" program is not exactly easy, as the ubiquity of the program name defeats search. sudo apt-get install which doesn't work out of the gate, so I was wondering if someone knew which repository which is found in (confusing?), or if I have to download it and compile from the source.

which is needed for me to get Buildroot set up.