I get the following npm error on installing Vue Js - node.js

Question

I installed Node.js using Snap on my Parrot OS system.
I don't know why, but I don't have the node_modules folder after /usr/local/lib
This is the error I get with npm install -g #vue/cli
npm WARN deprecated #hapi/joi#15.1.1: joi is leaving the #hapi organization and moving back to 'joi' (https://github.com/sideway/joi/issues/2411)
npm WARN deprecated request#2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated #hapi/bourne#1.3.2: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated #hapi/topo#3.1.6: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated #hapi/hoek#8.5.1: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated #hapi/address#2.1.4: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated har-validator#5.1.5: this library is no longer supported
npm WARN deprecated urix#0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated resolve-url#0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated chokidar#2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm WARN deprecated fsevents#1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
/usr/local/bin/vue -> /usr/local/lib/node_modules/#vue/cli/bin/vue.js
npm WARN lifecycle The node binary used for scripts is /snap/bin/node but npm is using /snap/node/2913/bin/node itself. Use the `--scripts-prepend-node-path` option to include the path for the node binary npm was executed with.
> core-js#3.6.5 postinstall /usr/local/lib/node_modules/#vue/cli/node_modules/core-js
> node -e "try{require('./postinstall')}catch(e){}"
2020/08/12 15:51:38.149740 cmd_run.go:918: WARNING: cannot create user data directory: cannot create "/nonexistent/snap/node/2913": mkdir /nonexistent: permission denied
cannot create user data directory: /nonexistent/snap/node/2913: Permission denied
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#^1.2.7 (node_modules/#vue/cli/node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN #vue/compiler-sfc#3.0.0-rc.5 requires a peer of vue#3.0.0-rc.5 but none is installed. You must install peer dependencies yourself.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! core-js#3.6.5 postinstall: `node -e "try{require('./postinstall')}catch(e){}"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the core-js#3.6.5 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! /root/.npm/_logs/2020-08-12T10_21_41_518Z-debug.log
edit :-
while using sudo i get the following error - sudo: npm: command not found. So I ran su first, then tried npm install -g #vue/cli but then i get the error originally asked in the question.

Answer 1

When you install npm packages globally, you have to run the install command as administrator.
try to run,
sudo npm install -g #vue/cli