While installing 'sudo npm install -g @angular/cli ' its gives error in ubuntu

I am facing issue When I try to install Angular-CLI on ubunutu
My Node.js and npm version

1. Node-v9.11.1
2. 
   npm - 5.6.0
   
   Command I executed
   savera9@savera9-desktop:~$ sudo npm install -g @angular/cli
   I am Getting Below Error
   
   
   
   npm ERR! git clone git@github.com:angular/cli Cloning into bare repository '/home/savera9/.npm/_git-remotes/git-github-com-angular-cli-515723dd'...
   
   npm ERR! git clone git@github.com:angular/cli Permission denied (publickey).
   
   npm ERR! git clone git@github.com:angular/cli fatal: Could not read from remote repository.
   
   npm ERR! git clone git@github.com:angular/cli
   
   npm ERR! git clone git@github.com:angular/cli Please make sure you have the correct access rights
   
   npm ERR! git clone git@github.com:angular/cli and the repository exists.
   
   npm ERR! addLocal Could not install angular/cli
   
   npm ERR! Error: ENOENT, stat 'angular/cli'
   
   npm ERR! If you need help, you may report this entire log,
   
   npm ERR! including the npm and node versions, at:
   
   npm ERR! http://github.com/npm/npm/issues
   
   npm ERR! System Linux 4.4.0-101-generic
   
   npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "@angular/cli"
   
   npm ERR! cwd /home/savera9
   
   npm ERR! node -v v0.10.36
   
   npm ERR! npm -v 1.4.28
   
   npm ERR! path angular/cli
   
   npm ERR! code ENOENT
   
   npm ERR! errno 34
   
   npm ERR!
   
   npm ERR! Additional logging details can be found in:
   
   npm ERR! /home/savera9/npm-debug.log
   
   npm ERR! not ok code 0
   ​

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