How to install NASM on Ubuntu
codeaft@codeaft:~$ su
Password: 
root@codeaft:/home/codeaft# apt install nasm
...
Preparing to unpack .../nasm_2.16.01-1_amd64.deb ...
Unpacking nasm (2.16.01-1) ...
Setting up nasm (2.16.01-1) ...
Processing triggers for man-db (2.11.2-1) ...

root@codeaft:/home/codeaft# nasm --version
NASM version 2.16.01