npm ERR! Error: EACCES: permission denied, access ‘/usr/local/lib/node_modules‘

$ sudo npm install n
npm ERR! Linux 5.4.0-84-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install" "-g" "npm"
npm ERR! node v8.10.0
npm ERR! npm  v3.5.2
npm ERR! path /usr/local/lib/node_modules
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall access
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
npm ERR!  { Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'access',
npm ERR!   path: '/usr/local/lib/node_modules' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Please include the following file with any support request:
npm ERR!     /home/tsit/npm-debug.log

sudo npm install --unsafe-perm=true --save-dev n
sudo npm install --unsafe-perm=true --allow-root --save-dev n