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gnutls_handshake() failed: Access was denied

Error when running apt-get:

sudo apt-get update && sudo apt-get install yarn

gnutls_handshake() failed: Access was denied

The problem:

There is proxy configuration error of apt-get

The fix:

Define proxy for apt-get

1. sudo vim /etc/apt/apt.conf
2. Add line:
 Acquire::http::proxy "";


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What is PKI

PKI = Public Key Infrastructure
(Resource) Method of asserting the identity and validity of a person (or entity) that you have not previously met or interacted.

It use of certificates containing identifying information and public keys (these certificates are more properly called X.509 certificates).

PKI accomplishes this by defining a central authority who is mutually trusted by all users of the system.