nmap used in linux

hi everyone, great site. I am a mature student trying to learn cyber security. have installed linux and trying to install nmap in linux. i have managed to get nmap running in windows 10 but the course uses linux. the error message comes up " bash nmap command not found. I have tried the help on the site e.g. turning windows features on and off, putting full path to nmap but still no luck.

Could anyone offer any other guidance?