ssh: Could not resolve hostname github.com: Name or service not known; fatal: The remote end hung up unexpectedly

Recently, I have seen this problem too. Below, you have my solution:

  1. ping github.com, if ping failed. it is DNS error.
  2. sudo vim /etc/resolv.conf, the add:
    nameserver 8.8.8.8
    nameserver 8.8.4.4

Or it can be a genuine network issue. Restart your network-manager using sudo service network-manager restart or fix it up

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