Can't install Yeoman on Ubuntu because my nodejs and npm are outdated

Question

I'm trying to install Yeoman via npm, but I get the following errors when I run npm install -g yo :

npm WARN deprecated npmconf@2.1.2: this package has been reintegrated into npm and is now out of date with respect to npm
/home/marieficid/.node/bin/yo -> /home/marieficid/.node/lib/node_modules/yo/lib/cli.js

> yo@1.6.0 postinstall /home/marieficid/.node/lib/node_modules/yo
> yodoctor


Yeoman Doctor
Running sanity checks on your system

✔ Global configuration file is valid
✖ Node.js version

Your Node.js version is outdated.
Upgrade to the latest version: https://nodejs.org

✔ No .bowerrc file in home directory
✔ No .yo-rc.json file in home directory
✖ npm version

Your npm version is outdated.

Upgrade to the latest version by running:
npm install -g npm

✔ NODE_PATH matches the npm root

Found potential issues on your machine :(
/home/marieficid/.node/lib
└── yo@1.6.0 

Which is very odd because when I run node --version && npm --version I get:

v4.3.1
3.7.3

And when I try to run npm install -gn I get:

/home/marieficid/.node/bin/n -> /home/marieficid/.node/lib/node_modules/n/bin/n
/home/marieficid/.node/lib
└── n@2.1.0 

I tried running this solution , which only brought me more issues: Now I can't run node --version , only n --version , which returns 2.1.0, and I can't run npm install -gn because I get this:

marieficid@mariana-K46CB:~$ npm install -g n
/usr/bin/env: node: Arquivo ou diretório não encontrado

Which means "directory not found". What can I do? I'm on Ubuntu 14.04, by the way.

EDIT: I think I screwed up my $PATH variable... does anyone know how to fix it?

Answer 1

You should run

npm install -g npm

not

npm install -g n

according to your output