SOCKET INSTALL IN UBUNTU 18.04 - node.js

Question

AM getting this error if i use
sudo npm install -g n
I used the above to install socket but facing the below errors
npm http GET https://registry.npmjs.org/socket.io
npm ERR! Error: SSL Error: CERT_UNTRUSTED
npm ERR! at ClientRequest.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/request/main.js:525:26)
npm ERR! at ClientRequest.g (events.js:192:14)
npm ERR! at ClientRequest.EventEmitter.emit (events.js:96:17)
npm ERR! at HTTPParser.parserOnIncomingClient [as onIncoming] (http.js:1462:7)
npm ERR! at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:111:23)
npm ERR! at CleartextStream.socketOnData [as ondata] (http.js:1367:20)
npm ERR! at CleartextStream.CryptoStream._push (tls.js:526:27)
npm ERR! at SecurePair.cycle (tls.js:880:20)
npm ERR! at EncryptedStream.CryptoStream.write (tls.js:267:13)
npm ERR! at Socket.ondata (stream.js:38:26)
npm ERR! If you need help, you may report this log at:
npm ERR! <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR! <npm-#googlegroups.com>
npm ERR! System Linux 4.18.0-15-generic
npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "install" "socket.io"
npm ERR! cwd /home/afreed
npm ERR! node -v v0.8.15
npm ERR! npm -v 1.1.66
npm ERR! code ESSL
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /home/afreed/npm-debug.log
npm ERR! not ok code 0
afreed#JARVIS:~$ sudo npm install -g n
npm http GET https://registry.npmjs.org/n
npm ERR! Error: SSL Error: CERT_UNTRUSTED
npm ERR! at ClientRequest.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/request/main.js:525:26)
npm ERR! at ClientRequest.g (events.js:192:14)
npm ERR! at ClientRequest.EventEmitter.emit (events.js:96:17)
npm ERR! at HTTPParser.parserOnIncomingClient [as onIncoming] (http.js:1462:7)
npm ERR! at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:111:23)
npm ERR! at CleartextStream.socketOnData [as ondata] (http.js:1367:20)
npm ERR! at CleartextStream.CryptoStream._push (tls.js:526:27)
npm ERR! at SecurePair.cycle (tls.js:880:20)
npm ERR! at EncryptedStream.CryptoStream.write (tls.js:267:13)
npm ERR! at Socket.ondata (stream.js:38:26)
npm ERR! If you need help, you may report this log at:
npm ERR! <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR! <npm-#googlegroups.com>
npm ERR! System Linux 4.18.0-15-generic
npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "n"
npm ERR! cwd /home/afreed
npm ERR! node -v v0.8.15
npm ERR! npm -v 1.1.66
npm ERR! code ESSL
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /home/afreed/npm-debug.log
npm ERR! not ok code 0

Answer 1

try this :
npm config set registry="http://registry.npmjs.org/"
or clear cache of your npm:
sudo npm cache clean -f
sudo npm install -g n
sudo n stable
or simply you can turn off ssl_cert (not recommended):
npm config set strict-ssl false