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Hello,
how to fix the problem?
please guys help me

root@neweraexplorer5:~# sudo npm install forever -g
/usr/local/lib/node_modules/npm/bin/npm-cli.js:84
let notifier = require('update-notifier')({pkg})
^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:374:25)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Function.Module.runMain (module.js:442:10)
at startup (node.js:136:18)
at node.js:966:3

root@neweraexplorer5:~# cd explorer && npm install --production
/usr/local/lib/node_modules/npm/bin/npm-cli.js:84
let notifier = require('update-notifier')({pkg})
^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:374:25)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Function.Module.runMain (module.js:442:10)
at startup (node.js:136:18)
at node.js:966:3

i am using ubuntu 16.04
tanks

Did you tried to update your node.js version? According to this article, people solve by updating node.js

https://medium.com/@sasikate.palm/npm-error-syntaxerror-block-scoped-declarations-let-const-function-class-not-yet-ae407385d9ea

https://askubuntu.com/questions/426750/how-can-i-update-my-nodejs-to-the-latest-version