Issue when installing node-sass - node.js

Question

I get an issue when installing node-sass :
gyp verb download contents checksum {"node-v10.2.1-headers.tar.gz":"3700814861e61288d7dd1c4115f40acac0cbd0abbdd4bfd650d4ae85cc02ecce"}
gyp verb validating download checksum for node-v10.2.1-headers.tar.gz (3700814861e61288d7dd1c4115f40acac0cbd0abbdd4bfd650d4ae85cc02ecce == 3700814861e61288d7dd1c4115f40acac0cbd0abbdd4bfd650d4ae85cc02ecce)
gyp verb get node dir target node version installed: 10.2.1
gyp verb build dir attempting to create "build" dir: /var/www/****/node_modules/node-sass/build
gyp ERR! configure error
gyp ERR! stack Error: EACCES: permission denied, mkdir '/var/www/****/node_modules/node-sass/build'
gyp ERR! System Linux 4.4.0-116-generic
gyp ERR! command "/usr/local/bin/node" "/var/www/****/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /var/www/****/node_modules/node-sass
gyp ERR! node -v v10.2.1
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok
Build failed with error code: 1
npm WARN gestiaweb#1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.4 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass#4.9.0 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass#4.9.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/****/.npm/_logs/2018-06-01T14_24_13_534Z-debug.log
Environment : Ubuntu (lastest)
NodeJS version : v10.2.1
Npm version : 5.6.0

Answer 1

gyp ERR! stack Error: EACCES: permission denied,
Its says permission denied. Try run with sudo
sudo npm i node-sass

Answer 2

It looks like there is a permissions issue. Can you install other packages?
If not make sure the user you are running the npm i node-gyp command has permissions to write to the appropriate directory.
chmod +w <path>/node_modules
In this case there seemed to be a permission issue with the user's node install
Solution:
sudo su && npm i node-sass