Connexion ssh renvoie "Permission denied (publickey)"

Bonjour,

J'ai consulté en vain les posts du forum concernant les difficultés rencontrées pour se connecter avec ssh  avec Linux Mint 22.1

J'ai un Raspberry 3 model B que je veux utiliser comme serveur. Tout fonctionnait bien jusqu'au moment où la connexion a affiché  

 "Permission denied (publickey)

J'ai cherché la solution dans un grand nombre d'es articles sur Internet, sans succès. J'ai donc reconfiguré la carte avec Raspberry Pi Imager mais la connexion reste toujours impossible. 

Des infos indispensables 

• Relance de ssh

bernard@bernardlm:~$ sudo systemctl reload ssh
bernard@bernardlm:~$ sudo systemctl status ssh
● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/usr/lib/systemd/system/ssh.service; enabled; preset: en>
     Active: active (running) since Wed 2025-09-24 07:17:54 CEST; 1h 15min ago
TriggeredBy: ● ssh.socket
.....
>
sept. 24 08:33:01 bernardlm sshd[1597]: Received SIGHUP; restarting.
sept. 24 08:33:01 bernardlm sshd[1597]: Server listening on 0.0.0.0 port 22.
sept. 24 08:33:01 bernardlm sshd[1597]: Server listening on :: port 22.
lines 1-25/25 (END)

Extraits 

USER@USERlm:~$ ssh -vvv  ***@***
OpenSSH_9.6p1 Ubuntu-3ubuntu13.14, OpenSSL 3.0.13 30 Jan 2024
debug1: Reading configuration data /home/USER/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config

.....................


debug3: remaining preferred: keyboard-interactive
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug3: ssh_get_authentication_socket_path: path '/run/user/1000/keyring/ssh'
debug1: get_agent_identities: bound agent to hostkey
debug1: get_agent_identities: agent returned 2 keys
debug1: Will attempt key: /home/USER/.ssh/id_ecdsa ECDSA SHA256:XXXXXXXXXXXXXXXX agent
debug1: Will attempt key: /home/USER/.ssh/id_ed25519 ED25519 SHA256:XXXXXXXXXXXXXXXXXXX agent
debug1: Will attempt key: /home/USER/.ssh/id_rsa
debug1: Will attempt key: /home/USER/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/USER/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/USER/.ssh/id_xmss
debug1: Will attempt key: /home/USER/.ssh/id_dsa
debug2: pubkey_prepare: done
debug1: Offering public key: /home/USER/.ssh/id_ecdsa ECDSA SHA256:XXXXXXXXXXXXXXXX agent
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
debug1: Offering public key: /home/USER/.ssh/id_ed25519 ED25519 SHA256:XXXXXXXXXXXXXXXXXXXXXX agent
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
debug1: Trying private key: /home/USER/.ssh/id_rsa
debug3: no such identity: /home/USER/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/USER/.ssh/id_ecdsa_sk
debug3: no such identity: /home/USER/.ssh/id_ecdsa_sk: No such file or directory
debug1: Trying private key: /home/USER/.ssh/id_ed25519_sk
debug3: no such identity: /home/USER/.ssh/id_ed25519_sk: No such file or directory
debug1: Trying private key: /home/USER/.ssh/id_xmss
debug3: no such identity: /home/USER/.ssh/id_xmss: No such file or directory
debug1: Trying private key: /home/USER/.ssh/id_dsa
debug3: no such identity: /home/USER/.ssh/id_dsa: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
***@***: Permission denied (publickey).

bernard@bernardlm:~/.ssh$ ls -l
total 24
-rw------- 1 bernard bernard    0 sept. 23 07:21 authorized_keys
-rw-r--r-- 1 bernard bernard    0 sept. 23 14:41 config
-rw------- 1 bernard bernard  736 sept. 23 09:45 id_ecdsa
-rw-r--r-- 1 bernard bernard  271 sept. 23 09:45 id_ecdsa.pub
-rw------- 1 bernard bernard  411 sept. 23 09:46 id_ed25519
-rw-r--r-- 1 bernard bernard   99 sept. 23 09:46 id_ed25519.pub
-rw-r--r-- 1 bernard bernard  426 sept. 22 21:55 known_hosts
-rw-r--r-- 1 bernard bernard    0 sept. 23 09:05 known_hosts2

bernard@bernardlm:~$ ssh-copy-id XXX@192.168.1.250
/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: 2 key(s) remain to be installed -- if you are prompted now it is to install the new keys
XXX@192.168.1.250: Permission denied (publickey).

Je n'ai pas trouvé comment répondre à 

/usr/bin/ssh-copy-id: INFO: 2 key(s) remain to be installed -- if you are prompted now it is to install the new keys

J'ai également modifié le fichier /etc/ssh/sshd_config (extraits)

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

Include /etc/ssh/sshd_config.d/*.conf

# When systemd socket activation is used (the default), the socket
# configuration must be re-generated after changing Port, AddressFamily, or
# ListenAddress.
#
# For changes to take effect, run:
#
   systemctl daemon-reload
   systemctl restart ssh.socket
#
Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key

# Ciphers and keying
#RekeyLimit default none

# Logging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

PubkeyAuthentication yes

Il y a peut-être un pb de droits qui m'a échappé. 

Merci à tous. 

Linux / Firefox 143.0