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ssh-addcommand can't communicate with the SSH agent. In your case, thessh-addcommand could not read your key (possibly due to a permission or ownership issue; you may have usedsudoto generate the key or to create the~/.sshdirectory).$SSH_AUTH_SOCKenvironment variable points to. If the variable is unset (if you never started the agent),ssh-addsaysCould not open a connection to your authentication agent.