install pm2 on dawinop (ubuntu 12.04)

robotis@robotis:~$ npm i pm2 -g
npm http GET https://registry.npmjs.org/pm2

npm ERR! Error: failed to fetch from registry: pm2
npm ERR!     at /usr/share/npm/lib/utils/npm-registry-client/get.js:139:12
npm ERR!     at cb (/usr/share/npm/lib/utils/npm-registry-client/request.js:31:9)
npm ERR!     at Request._callback (/usr/share/npm/lib/utils/npm-registry-client/request.js:136:18)
npm ERR!     at Request.callback (/usr/lib/nodejs/request/main.js:119:22)
npm ERR!     at Request. (/usr/lib/nodejs/request/main.js:212:58)
npm ERR!     at Request.emit (events.js:88:20)
npm ERR!     at ClientRequest. (/usr/lib/nodejs/request/main.js:412:12)
npm ERR!     at ClientRequest.emit (events.js:67:17)
npm ERR!     at HTTPParser.onIncoming (http.js:1261:11)
npm ERR!     at HTTPParser.onHeadersComplete (http.js:102:31)
npm ERR! You may report this log at:
npm ERR!     
npm ERR! or use
npm ERR!     reportbug --attach /home/robotis/npm-debug.log npm
npm ERR!
npm ERR! System Linux 3.2.66-op2
npm ERR! command "node" "/usr/bin/npm" "i" "pm2" "-g"
npm ERR! cwd /home/robotis
npm ERR! node -v v0.6.12
npm ERR! npm -v 1.1.4
npm ERR! message failed to fetch from registry: pm2
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     /home/robotis/npm-debug.log
npm not ok

sudo add-apt-repository ppa:chris-lea/node.js  
sudo apt-get update  
sudo apt-get install nodejs

node -v

npm -v

npm install pm2 -g

robotis@robotis:~$ npm install pm2 -g
npm ERR! Error: EACCES, mkdir '/usr/lib/node_modules/pm2'
npm ERR!  { [Error: EACCES, mkdir '/usr/lib/node_modules/pm2']
npm ERR!   errno: 3,
npm ERR!   code: 'EACCES',
npm ERR!   path: '/usr/lib/node_modules/pm2',
npm ERR!   fstream_type: 'Directory',
npm ERR!   fstream_path: '/usr/lib/node_modules/pm2',
npm ERR!   fstream_class: 'DirWriter',
npm ERR!   fstream_stack:
npm ERR!    [ '/usr/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23',
npm ERR!      '/usr/lib/node_modules/npm/node_modules/mkdirp/index.js:46:53',
npm ERR!      'Object.oncomplete (fs.js:108:15)' ] }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

npm ERR! System Linux 3.2.66-op2
npm ERR! command "/usr/bin/node" "/usr/bin/npm" "install" "pm2" "-g"
npm ERR! cwd /home/robotis
npm ERR! node -v v0.10.37
npm ERR! npm -v 1.4.28
npm ERR! path /usr/lib/node_modules/pm2
npm ERR! fstream_path /usr/lib/node_modules/pm2
npm ERR! fstream_type Directory
npm ERR! fstream_class DirWriter
npm ERR! code EACCES
npm ERR! errno 3
npm ERR! stack Error: EACCES, mkdir '/usr/lib/node_modules/pm2'
npm ERR! fstream_stack /usr/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23
npm ERR! fstream_stack /usr/lib/node_modules/npm/node_modules/mkdirp/index.js:46:53
npm ERR! fstream_stack Object.oncomplete (fs.js:108:15)
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     /home/robotis/npm-debug.log
npm ERR! not ok code 0

sudo npm install pm2 -g

pm2 -v