Who can help instruct the installation of node-sass (and then Takana) in Ubuntu?

Question

Node.js

Hey!
I put node-sass, and he, the scoundrel, is installed somewhere, but he swears at the call from the CLI with dirty words: "There is no such file or directory." I understand very little in the command line, but it seems to have installed in an unexpected place. I'm going to solve the problem on Github, he says, it's already happened, don't worry

Some users have reported issues installing on Ubuntu due to node being registered to another package. Follow the official NodeJS docs to install NodeJS so that #!/usr/bin/env node correctly resolved.

Yeah. I go through everything in the second circle, but node and npm are again not where they should be, and if I understand correctly, then it should be in /usr/bin/env node, right? Help, I've been suffering for two days.