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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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