Estoy intentando instalar mecanografiado con comandonpm install -g typescript, y devuelve este error:

    npm ERR! Error: EACCES: permission denied, access '/usr/lib/node_modules'
    npm ERR!     at Error (native)
    npm ERR!  { Error: EACCES: permission denied, access '/usr/lib/node_modules'
    npm ERR!     at Error (native)
    npm ERR!   errno: -13,
    npm ERR!   code: 'EACCES',
    npm ERR!   syscall: 'access',
    npm ERR!   path: '/usr/lib/node_modules' }
    npm ERR! 
    npm ERR! Please try running this command again as root/Administrator.
    npm ERR! Linux 4.4.0-93-generic
    npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "-g" "typescript"
    npm ERR! node v6.11.2
    npm ERR! npm  v3.10.10
    npm ERR! path npm-debug.log.1024969454
    npm ERR! code EACCES
    npm ERR! errno -13
    npm ERR! syscall open

    npm ERR! Error: EACCES: permission denied, open 'npm-debug.log.1024969454'
    npm ERR!     at Error (native)
    npm ERR!  { Error: EACCES: permission denied, open 'npm-debug.log.1024969454'
    npm ERR!     at Error (native)
    npm ERR!   errno: -13,
    npm ERR!   code: 'EACCES',
    npm ERR!   syscall: 'open',
    npm ERR!   path: 'npm-debug.log.1024969454' }
    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!     /npm-debug.log
    jramirez@jramirez:/$ ^C
    jramirez@jramirez:/$ npm install typescript
    npm WARN checkPermissions Missing write access to /
    /
    └── [email protected] 

    npm WARN enoent ENOENT: no such file or directory, open '/package.json'
    npm WARN !invalid#1 No description
    npm WARN !invalid#1 No repository field.
    npm WARN !invalid#1 No README data
    npm WARN !invalid#1 No license field.
    npm ERR! Linux 4.4.0-93-generic
    npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "typescript"
    npm ERR! node v6.11.2
    npm ERR! npm  v3.10.10
    npm ERR! path /
    npm ERR! code EACCES
    npm ERR! errno -13
    npm ERR! syscall access

    npm ERR! Error: EACCES: permission denied, access '/'
    npm ERR!     at Error (native)
    npm ERR!  { Error: EACCES: permission denied, access '/'
    npm ERR!     at Error (native) errno: -13, code: 'EACCES', syscall: 'access', path: '/' }
    npm ERR! 
    npm ERR! Please try running this command again as root/Administrator.
    npm ERR! Linux 4.4.0-93-generic
    npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "typescript"
    npm ERR! node v6.11.2
    npm ERR! npm  v3.10.10
    npm ERR! path npm-debug.log.2387664261
    npm ERR! code EACCES
    npm ERR! errno -13
    npm ERR! syscall open

    npm ERR! Error: EACCES: permission denied, open 'npm-debug.log.2387664261'
    npm ERR!     at Error (native)
    npm ERR!  { Error: EACCES: permission denied, open 'npm-debug.log.2387664261'
    npm ERR!     at Error (native)
    npm ERR!   errno: -13,
    npm ERR!   code: 'EACCES',
    npm ERR!   syscall: 'open',
    npm ERR!   path: 'npm-debug.log.2387664261' }
    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!     /npm-debug.log

Además corro tambiénnpm install typescript (sin -g), pero ¿no funciona o existe alguna otra forma de instalar el mecanografiado? Mi sistema operativo es Linux Ubuntu 16.04. Raramente usonode y no sé cómo solucionar este problema.

Mi pregunta es: exactamente, ¿qué directorios necesitan esas permisos?