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ubuntu 18.04- ember: command not found

I know this has been addressed before, but I've tried the advice on No command 'ember' found and it hasn't worked for me.
I'm trying to install EmberJs for a techtest and I keep getting 'Command 'ember' not found'. I'm on Ubuntu 18.04, and have checked all my paths as follows.
When I run npm install -g ember-cli it installs and shows:
npm WARN deprecated exists-sync#0.0.4: Please replace with usage of
fs.existsSync
/home/[user]/.npm-global/bin/ember ->
/home/[user]/.npm-global/lib/node_modules/ember-cli/bin/ember
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.4
(node_modules/ember-cli/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for
fsevents#1.2.4: wanted {"os":"darwin","arch":"any"} (current:
{"os":"linux","arch":"x64"})
+ ember-cli#3.5.0
updated 1 package in 14.662s
So I've definitely got it installed.
When I run which npm/ which node I get the following respectively:
/usr/bin/npm
/usr/bin/node
When I run echo $PATH I get:
/home/[user]/npm_global/bin:/usr/local/share/npm/bin:
/usr/local/bin:/usr/local/sbin:~/bin:/usr/share/rvm/gems/ruby-2.3.7/
bin:/usr/share/rvm/gems/ruby-2.3.7#global/bin:/usr/share/rvm/rubies/
ruby-2.3.7/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/
sbin:/bin:/usr/games:/usr/local/games:/usr/bin:/snap/bin:/usr/
share/rvm/bin
Andddd I have these paths in my bashrc:
export PATH="/usr/local/share/npm/bin:/usr/local/bin:/usr/local/sbin:~/bin:$PATH"
and
export PATH="/home/[user]/npm_global/bin:$PATH"
I realise this is a lot of info, I'm new to this so wanted to give as much as I could. Any suggestions very much appreciated, thank you!

The error you are experiencing means that ember is not in the path. It's really irrelevant if you've installed with npm or downloaded the files manually for the purposes of properly setting up your path. When you encounter a PATH issue the solution is quite simple.
Find the executable. find / -name ember if you want to include symlinks, or just find -type f -name ember if you want only the actual location (npm installs will install in their own managed directory and then symlink to the typical location for binary files such as /usr/local/bin on macOS)
Once found, use your shell's properties file like bashrc to append the directory containing the executable to the $PATH variable.
It's as simple as that. Binary files that are found in your $PATH can be executed. Make sure you see the path to ember there, or manually add the full path that you find in step 1 to your $PATH in bashrc with export PATH=$PATH_TO_DIR_WITH_EMBER_BIN:$PATH which concatenates to the existing $PATH variable

Best way to test global npm modules

Lets say I develop a global npm module called mytool that registers a env variable through "bin" in package.json with the name mytool.
So after I install it globally by typing
npm install mytool -g
then I can type mytool --someOption in terminal and handle the CLI input in javascript. Now lets assume that mytool works a lot with the current working directory of the CLI, so to just
node index.js --someOption
is a bad idea.
However to test for bugs I don't want to push a new version of "mytool" to npm and then install it globally from npm. Rather I want to be able to test this all locally.
Question: What is the best way to do test global npm modules without publishing to npm?

npm link
Contrary to what it seems, npm link can also be used in your case, too.
Just run it on the root folder of your project. No additional arguments are necessary.
Using it in you package folder will create a symlink in the global folder {prefix}/lib/node_modules/<package> that links to the package where the npm link command was executed.
It will also link any bins in the package to {prefix}/bin/{name}.

Angular JS 2 can't be installed, why?

I have tried setting up Angular 2 to experiment with on my VPS. The needed steps are here:
https://angular.io/docs/js/latest/quickstart.html
The first command is successful:
$ npm install -g tsd#^0.6.0
But the second step causes an error:
tsd install angular2 es6-promise rx rx-lite
"/usr/bin/env: node: No such file or directory" is the error I get. I have tried installing this in my project folder as root, but that also didn't had success. Does someone know why I get this error? The command doesn't exist, but why not?
Is there an easier way to install this? I have seen "npm install angular2", but I don't know how that works, that's why I tried the steps

You may need to make a symbolic link to node:
ln -s /usr/bin/nodejs /usr/bin/node
(see https://stackoverflow.com/a/26320915/2033574)

Install node extensions without commands

I am doing an internship in a company.
I need to create a node server.
I installed node on the computer (Windows) and I should install some plugins like:
- nodejs-webpack
- colors
- uglify
Normally I need to enter a command like : npm install "theModule"
But the software can not access the internet (due to company restrictions) and support service can not authorize the software (or do not want).
Can I install modules in any other way ? (download from Google and slide archives in the correct folder for example).
If the answer is no, do you know how can i get around this security?

You need a private npm repository.
Check out this answer:
can you host a private repository for your organization to use with npm?

I found it !
Just for exemple, we will install 'nodejs-websocket' :
1) You just have to download it here.
2) Put files into your Node's directory (for me it's "C:\Program Files\nodejs\node_modules\npm\node_modules")
3) in your .js file just add this line : var ws = require("C:/Program Files/nodejs/node_modules/npm/node_modules/nodejs-websocket/")
Done ! Thanks for all :D

I added this as a comment on your own answer, but I figured I should add a real answer with a better explanation.
Normally when you run npm install package-name npm installs the package to a node_modules directory in the directory you are in at that moment. So if your app was located at C:\code\my-app then you would cd into that directory and run npm install package-name. This would create a node_modules directory at C:\code\my-app\node_modules if it didn't already exist. Then it would install package-name into that directory at C:\code\my-app\node_modules\package-name.
As long as the module is in the node_modules directory for your app, you can require the module in your code without entering a big long file path.
var ws = require('nodejs-websocket');
The place you manually installed your module is the global node_modules directory. It's where npm would install a module if you did npm install -g package-name. The global node_modules directory is added to your system path when you install npm. In other words, any modules you install in there would be accessible from the command line like any other command. For example:
npm install -g bower
That would install the "bower" package to the global npm module directory. Bower would then be accessible as a command line tool for you to use. For example:
bower install angularjs
The global directory is more for tools like that and not really for modules that you intend to use in your code. Technically you can require a module from anywhere by including the full path in the require call like you did, but the standard practice would be to place it in the node_modules directory in the root of your application, and then require it with just its name and not a full path.
Edit: Here's another tip that you might like to take advantage of as well.
When you normally install a module with npm install package-name, your application usually has a package.json file at the root of it. If it does, you can do npm install package-name --save and npm will add the package-name module to a list in your app's package.json file. Once a module is listed in your app's package.json file it's called a "dependency" of your app because it basically says your app depends on package-name.
Normally, when you have dependencies listed in package.json, you can completely delete your app's node_modules directory and then simply run npm install from within your app's root directory and npm will automatically install all dependencies it finds listed in your app's package.json file. Since your corporate firewall won't allow this automatic downloading of modules, you won't get that benefit. However it is still good practice to follow the same conventions.
A trick you can do to create your package.json file is to manually install your dependencies into your app's node_modules directory. Once you have the modules your app needs, you can instruct npm to create a package.json file for your app by simply running npm init. It will walk you through a few little prompts to fill out your package.json file with details about your app. It will then peek inside your node_modules directory to see if you've already installed any modules before having a package.json file. If it finds any, it will automatically add them to the dependencies field in the package.json file it creates :D
With a proper package.json in place you'll always have a nice tidy list of what dependencies your application needs, even if your node_modules directory gets deleted. Normally people add their app's node_modules directory to their .gitignore file, only checking in the package.json file. This way they don't store their dependencies in source control but they can still be easily installed on new machines that clone it by simply running npm install from inside the app's directory. In your case though you may want to just add node_modules to your source control since you can't let npm install dependencies automatically.

Karma-Runner on Ubuntu: 'usr/bin/env: node: No such file or directory' error

I am trying to set up the JavaScript code tester Karma, but when I run the command to initialise karma I get the error 'usr/bin/env: node: No such file or directory'. How can I fix it?

As per #digitalmediums
I've found this is often a misnaming error, if you install from a package manager you bin may be called nodejs so you just need to symlink it like so "sudo ln -s /usr/bin/nodejs /usr/bin/node"

sudo ln -s /usr/bin/nodejs /usr/bin/node
this worked for me.
node is a reserved term in ubuntu thus node.js is actually nodejs.

I found a similar question with same issue here
Usually the non packaged node version (not nodejs) that the user installs can be run from /usr/local/bin/node
as
#!/usr/local/bin/node