node.js - npm install express-generator not installing express -

i'm following mean stack tutorial requires me have express installed:

i run this:

npm install -g express-generator

and results:

username@username-inspiron-3521:~$ npm install -g express-generator /home/username/npm/bin/express -> /home/username/npm/lib/node_modules/express-generator/bin/express express-generator@4.13.1 /home/username/npm/lib/node_modules/express-generator ├── sorted-object@1.0.0 ├── mkdirp@0.5.1 (minimist@0.0.8) └── commander@2.7.1 (graceful-readlink@1.0.1) 

but when do

express --ejs flapper-news

the program 'express' not installed. can install typing: sudo apt-get install node-express 

what doing wrong?

thanks time.

edit

when npm install

username@username-inspiron-3521:~/documents/mean/flapper_news$ npm install npm err! install couldn't read dependencies npm err! linux 3.16.0-51-generic npm err! argv "/home/username/local/bin/node" "/home/username/local/bin/npm" "install" npm err! node v4.2.1 npm err! npm  v2.14.7 npm err! path /home/username/documents/mean/flapper_news/package.json npm err! code enopackagejson npm err! errno -2 npm err! syscall open  npm err! package.json enoent: no such file or directory, open '/home/username/documents/mean/flapper_news/package.json' npm err! package.json not problem npm itself. npm err! package.json npm can't find package.json file in current directory.  npm err! please include following file support request: npm err!     /home/username/documents/mean/flapper_news/npm-debug.log 

edit2

after running npm install -g express , typing express -v this:

bash: /usr/bin/express: no such file or directory

edit3

this .bashrc file:

### added heroku toolbelt export path="/usr/local/heroku/bin:$path"  export path="$path:$home/.rvm/bin" # add rvm path scripting export path=$home/local/bin:$path export node_path=/usr/lib/nodejs:/usr/lib/node_modules:/usr/share/javascript:/home/username/npm/lib/node_modules export path=/home/username/android/sdk/platform-tools:$path export path=/home/username/android/sdk/tools:$path 

looking @ line output npm install -g express generator

/home/username/npm/bin/express -> /home/username/npm/lib/node_modules/express-generator/bin/express 

your npm installing global modules within home directory , it's placing binary links in /home/username/npm/bin directory, you'll need add path. add .bashrc:

export path=$home/npm/bin:$path