SSH公钥认证在Ubuntu失败但在macOS成功的问题求助

各位好，我碰到了一个奇怪的SSH公钥认证问题，想请大家帮忙分析下：

我有两台机器，一台是macOS，一台是新配置的Ubuntu。在macOS上我可以正常用自己的公私钥通过SSH连接到目标服务器，但把同一组公私钥复制到Ubuntu上后，连接却失败了。另外要说明的是，macOS使用的是SSH v1，Ubuntu使用的是SSH v2。

1. macOS环境情况 #

.ssh目录下的文件： #

• /home/richardm/.ssh/id_rsa
• /home/richardm/.ssh/id_rsa.pub
• /home/richardm/.ssh/config
• /home/richardm/.ssh/known_hosts

配置文件（config）内容： #

Host *
AddKeysToAgent yes
UseKeychain yes
IdentityFile ~/.ssh/id_rsa
ServerAliveInterval 240
User = richard
ForwardAgent yes
StrictHostKeyChecking=no
IdentitiesOnly yes

SSH连接调试输出（执行命令：ssh -A -J richard@XX.XXX.XXX.XXX dev-myco-node01 -vvv）： #

debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /Users/richardm/.ssh/id_rsa RSA SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI explicit agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /Users/richardm/.ssh/id_rsa RSA SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI explicit agent
debug3: sign_and_send_pubkey: RSA SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).

2. Ubuntu环境情况 #

.ssh目录下的文件： #

• /home/richardm/.ssh/id_rsa
• /home/richardm/.ssh/id_rsa.pub
• /home/richardm/.ssh/config
• /home/richardm/.ssh/known_hosts

配置文件（config）内容： #

Host *
AddKeysToAgent yes
#  UseKeychain yes
IdentityFile ~/.ssh/id_rsa
ServerAliveInterval 240
User = richard
ForwardAgent yes
StrictHostKeyChecking=no
IdentitiesOnly yes

SSH连接调试输出（执行命令：ssh -A -J richard@XX.XXX.XXX.XXX richard@dev-myco-node01 -vvv）： #

debug3: preferred publickey
debug3: authmethod_lookup publickey
debug3: remaining preferred:
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/richardm/.ssh/id_rsa RSA SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI explicit agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/richardm/.ssh/id_rsa RSA SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI explicit agent
debug3: sign_and_send_pubkey: using publickey with RSA SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:CKEVmfXXXXXXXXXXXXXXXXXXXXXXXXXXXFrkI
sign_and_send_pubkey: signing failed for RSA "/home/richardm/.ssh/id_rsa" from agent: agent refused operation
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
richard@XX.XXX.XXX.XXX: Permission denied (publickey).
kex_exchange_identification: Connection closed by remote

从输出里能看到，Ubuntu这边服务器已经接受了公钥，但签名环节提示agent refused operation，最终导致权限被拒。有没有朋友遇到过类似问题？麻烦帮忙指点下可能的原因和解决办法，谢谢！

备注：内容来源于stack exchange，提问作者Richard