这报错是因为远程服务器ssh没有启用ssh-ed25519的key验证导致的问题。
解决办法就是修改sshd的配置,启用ssh-ed25519的部分之后,重启sshd既可。

解决办法来自:https://github.com/connectbot/connectbot/issues/477#issuecomment-280749514

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