我是 SSH 新手，一直在寻找解决方案。我正尝试通过 ssh 从我的 WSL（我使用的是 wsl2）连接到运行在 Ubuntu 上的大学服务器。我的子系统也在 Ubuntu（20.04.4）上运行。
我的主管手动将我的公钥添加到我的用户帐户。他还测试了使用他的密钥连接到我的用户，结果成功了。
但是，每当我尝试连接时，我只会收到错误消息
user@hostname: Permission denied (publickey).
我还尝试使用相同的密钥连接到测试服务器，一切正常。因此，漏洞不可能出在我的密钥上。
有什么建议吗？提前致谢！
附言：
对于有耐心阅读连接日志的任何人：
OpenSSH_8.2p1 Ubuntu-4ubuntu0.5, OpenSSL 1.1.1f 31 Mar 2020
debug1: Reading configuration data /home/luca/.ssh/config
debug1: /home/luca/.ssh/config line 10: Applying options for cog_mod
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolving "hostname" port 22
debug2: ssh_connect_direct
debug1: Connecting to hostname [134.2.42.97] port 22.
debug1: Connection established.
debug1: identity file /home/luca/.ssh/BT_id_rsa type 0
debug1: identity file /home/luca/.ssh/BT_id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.4
debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to hostname:22 as 'user'
debug3: hostkeys_foreach: reading file "/home/luca/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/luca/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from hostname
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:Uh2TNabn6QmSPX7qC0to6eZ1fH08Y7SKDObpoh4OTQg
debug3: hostkeys_foreach: reading file "/home/luca/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/luca/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from hostname
debug3: hostkeys_foreach: reading file "/home/luca/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/luca/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from 134.2.42.97
debug1: Host 'hostname' is known and matches the ECDSA host key.
debug1: Found key in /home/luca/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /home/luca/.ssh/BT_id_rsa RSA SHA256:zDHcVHXmiDIIqxa0JAwXzgqjaG9izz6fCLhMGuPDsQw explicit
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,[email protected],ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected]>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred gssapi-with-mic,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: /home/luca/.ssh/BT_id_rsa RSA SHA256:zDHcVHXmiDIIqxa0JAwXzgqjaG9izz6fCLhMGuPDsQw explicit
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
user@hostname: Permission denied (publickey).
测试服务器的连接日志直到倒数第五行都是相同的，从那里开始它区分为
debug1: Offering public key: /home/luca/.ssh/BT_id_rsa RSA SHA256:zDHcVHXmiDIIqxa0JAwXzgqjaG9izz6fCLhMGuPDsQw explicit
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/luca/.ssh/BT_id_rsa RSA SHA256:zDHcVHXmiDIIqxa0JAwXzgqjaG9izz6fCLhMGuPDsQw explicit
debug3: sign_and_send_pubkey: RSA SHA256:zDHcVHXmiDIIqxa0JAwXzgqjaG9izz6fCLhMGuPDsQw
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:zDHcVHXmiDIIqxa0JAwXzgqjaG9izz6fCLhMGuPDsQw
Enter passphrase for key '/home/luca/.ssh/BT_id_rsa':
我的 ~/.ssh/config 文件：
Host cog_mod
Hostname hostname
User user
PubKeyAuthentication yes
IdentitiesOnly yes
IdentityFile /home/luca/.ssh/BT_id_rsa