I have confirmed the fix using openssh 1:9.0p1-1ubuntu7.3 from kinetic-proposed: Test 1: root@kinetic:~# apt-cache policy openssh-server openssh-server: Installed: 1:9.0p1-1ubuntu7.3 Candidate: 1:9.0p1-1ubuntu7.3 Version table: *** 1:9.0p1-1ubuntu7.3 500 500 http://archive.ubuntu.com/ubuntu kinetic-proposed/main amd64 Packages 100 /var/lib/dpkg/status 1:9.0p1-1ubuntu7.1 500 500 http://archive.ubuntu.com/ubuntu kinetic-updates/main amd64 Packages 1:9.0p1-1ubuntu7 500 500 http://archive.ubuntu.com/ubuntu kinetic/main amd64 Packages root@kinetic:~# ssh localhost The authenticity of host 'localhost (::1)' can't be established. ED25519 key fingerprint is SHA256:xmU0f5QuqvJ8GZVhZihANPUgBhUzvYo96entI7JuoRk. This key is not known by any other names Are you sure you want to continue connecting (yes/no/[fingerprint])? yes Warning: Permanently added 'localhost' (ED25519) to the list of known hosts. Welcome to Ubuntu 22.10 (GNU/Linux 6.2.0-20-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. root@kinetic:~# systemctl reload ssh.service root@kinetic:~# systemctl status ssh.service ● ssh.service - OpenBSD Secure Shell server Loaded: loaded (/lib/systemd/system/ssh.service; disabled; preset: enabled) Drop-In: /etc/systemd/system/ssh.service.d └─00-socket.conf /run/systemd/system/service.d └─zzz-lxc-service.conf Active: active (running) since Fri 2023-06-02 13:48:58 UTC; 42s ago TriggeredBy: ● ssh.socket Docs: man:sshd(8) man:sshd_config(5) Process: 1012 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS) Process: 1046 ExecReload=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS) Process: 1047 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS) Main PID: 1013 (sshd) Tasks: 1 (limit: 18854) Memory: 3.2M CPU: 94ms CGroup: /system.slice/ssh.service └─1013 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups" Jun 02 13:48:58 kinetic systemd[1]: Starting OpenBSD Secure Shell server... Jun 02 13:48:58 kinetic sshd[1013]: Server listening on :: port 22. Jun 02 13:48:58 kinetic systemd[1]: Started OpenBSD Secure Shell server. Jun 02 13:49:00 kinetic sshd[1014]: Accepted publickey for root from ::1 port 44690 ssh2: RSA SHA256:A+T8Yt6KxQdy0hmT8> Jun 02 13:49:00 kinetic sshd[1014]: pam_unix(sshd:session): session opened for user root(uid=0) by (uid=0) Jun 02 13:49:00 kinetic sshd[1014]: pam_env(sshd:session): deprecated reading of user environment enabled Jun 02 13:49:26 kinetic systemd[1]: Reloading OpenBSD Secure Shell server... Jun 02 13:49:26 kinetic sshd[1013]: Received SIGHUP; restarting. Jun 02 13:49:26 kinetic systemd[1]: Reloaded OpenBSD Secure Shell server. Jun 02 13:49:27 kinetic sshd[1013]: Server listening on :: port 22. Test 2: root@kinetic:~# vi /etc/default/ssh root@kinetic:~# cat /etc/default/ssh # Default settings for openssh-server. This file is sourced by /bin/sh from # /etc/init.d/ssh. # Options to pass to sshd SSHD_OPTS=-ddd root@kinetic:~# ssh localhost Welcome to Ubuntu 22.10 (GNU/Linux 6.2.0-20-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage Last login: Fri Jun 2 13:49:00 2023 from ::1 debug1: PAM: reinitializing credentials debug1: permanently_set_uid: 0/0 debug3: Copy environment: XDG_SESSION_ID=104 debug3: Copy environment: XDG_RUNTIME_DIR=/run/user/0 debug3: Copy environment: DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/0/bus debug3: Copy environment: XDG_SESSION_TYPE=tty debug3: Copy environment: XDG_SESSION_CLASS=user debug3: Copy environment: PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin debug3: Copy environment: LANG=en_US.UTF-8 Environment: LANG=en_US.UTF-8 USER=root LOGNAME=root HOME=/root PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin SHELL=/bin/bash TERM=xterm-256color XDG_SESSION_ID=104 XDG_RUNTIME_DIR=/run/user/0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/0/bus XDG_SESSION_TYPE=tty XDG_SESSION_CLASS=user SSH_CLIENT=::1 47582 22 SSH_CONNECTION=::1 47582 ::1 22 SSH_TTY=/dev/pts/2 root@kinetic:~# systemctl status ssh.service ● ssh.service - OpenBSD Secure Shell server Loaded: loaded (/lib/systemd/system/ssh.service; disabled; preset: enabled) Drop-In: /etc/systemd/system/ssh.service.d └─00-socket.conf /run/systemd/system/service.d └─zzz-lxc-service.conf Active: active (running) since Fri 2023-06-02 13:56:50 UTC; 6s ago TriggeredBy: ● ssh.socket Docs: man:sshd(8) man:sshd_config(5) Process: 142 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS) Main PID: 143 (sshd) Tasks: 0 (limit: 18854) Memory: 1.8M CPU: 42ms CGroup: /system.slice/ssh.service ‣ 143 "sshd: root@pts/2" Jun 02 13:56:51 kinetic sshd[143]: debug1: server_input_channel_req: channel 0 request shell reply 1 Jun 02 13:56:51 kinetic sshd[143]: debug1: session_by_channel: session 0 channel 0 Jun 02 13:56:51 kinetic sshd[143]: debug1: session_input_channel_req: session 0 req shell Jun 02 13:56:51 kinetic sshd[143]: Starting session: shell on pts/2 for root from ::1 port 47582 id 0 Jun 02 13:56:51 kinetic sshd[143]: debug2: fd 4 setting TCP_NODELAY Jun 02 13:56:51 kinetic sshd[143]: debug3: set_sock_tos: set socket 4 IPV6_TCLASS 0x10 Jun 02 13:56:51 kinetic sshd[143]: debug2: channel 0: rfd 10 isatty Jun 02 13:56:51 kinetic sshd[143]: debug2: fd 10 setting O_NONBLOCK Jun 02 13:56:51 kinetic sshd[143]: debug3: fd 7 is O_NONBLOCK Jun 02 13:56:51 kinetic sshd[143]: debug3: send packet: type 99