使用 SSH 密钥配置新的 Digital Ocean Droplet。当我运行ssh-copy-id这就是我得到的：

ssh-copy-id user@012.345.67.89
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
sign_and_send_pubkey: signing failed: agent refused operation
user@012.345.67.89's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'user@012.345.67.89'"
and check to make sure that only the key(s) you wanted were added.

但是，当我尝试 ssh 时，会发生这种情况：

ssh user@012.345.67.89
sign_and_send_pubkey: signing failed: agent refused operation
user@012.345.67.89's password:

输入密码后，我就可以正常登录了，但这当然违背了首先创建 SSH 密钥的目的。我决定看一下 ssh-agent 服务器端，这就是我得到的：

user@012.345.67.89:~# eval `ssh-agent -s`
Agent pid 5715
user@012.345.67.89:~# ssh-add -l
The agent has no identities.

user/.ssh/authorized_keys 确实包含一个 ssh-rsa 密钥条目，但find -name "keynamehere"没有返回任何内容。