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Add explanation of a possible fix for the signing failed: agent refused operation error

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Signed-off-by: Peter Engelbert <pmengelbert@gmail.com>
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Peter Engelbert 2022-04-22 09:44:14 -05:00
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@ -2718,6 +2718,8 @@ Before you unmount your backup, ask yourself if you should make another one just
- If you still receive the error, `sign_and_send_pubkey: signing failed: agent refused operation` - edit `~/.gnupg/gpg-agent.conf` to set a valid `pinentry` program path, e.g. `pinentry-program /usr/local/bin/pinentry-mac` on macOS.
- If you still receive the error, `sign_and_send_pubkey: signing failed: agent refused operation` - it is a [known issue](https://bbs.archlinux.org/viewtopic.php?id=274571) that openssh 8.9p1 and higher has issues with YubiKey. Adding `KexAlgorithms -sntrup761x25519-sha512@openssh.com` to `/etc/ssh/ssh_config` often resolves the issue.
- If you receive the error, `The agent has no identities` from `ssh-add -L`, make sure you have installed and started `scdaemon`.
- If you receive the error, `Error connecting to agent: No such file or directory` from `ssh-add -L`, the UNIX file socket that the agent uses for communication with other processes may not be set up correctly. On Debian, try `export SSH_AUTH_SOCK="/run/user/$UID/gnupg/S.gpg-agent.ssh"`. Also see that `gpgconf --list-dirs agent-ssh-socket` is returning single path, to existing `S.gpg-agent.ssh` socket.