npm install Error: rollbackFailedOptional

Question

When I try npm install new packages it shows me this error:

rollbackFailedOptional: verb npm-session 585aaecfe5f9a82

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Answer 1

    # first this
    > npm config rm proxy
    > npm config rm https-proxy

    # then this
    > npm config set registry https://registry.npmjs.org/

solved my problem.

Again: Be sure to check whether you have internet connected properly.