Hi, I'm facing the same issue on the same machine (on MAAS), but I didn't reach lunar yet: first, I did a do-dist-upgrade from jammy to Kinetic (prompt normal). I collected the info requested in comment #2: ubuntu@node-horsea:~$ sudo fuser -n tcp 22 22/tcp: 1133 214495 214551 ubuntu@node-horsea:~$ sudo netstat -natpl | grep ":22" tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1133/sshd: /usr/sbi tcp 0 52 10.245.171.244:22 10.172.195.194:55174 ESTABLISHED 214495/sshd: ubuntu tcp6 0 0 :::22 :::* LISTEN 1133/sshd: /usr/sbi ubuntu@node-horsea:~$ sudo ps -ef | grep 1133 | grep -v grep root 1133 1 0 Jul13 ? 00:00:00 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups root 214495 1133 0 Jul20 ? 00:00:00 sshd: ubuntu [priv] ubuntu@node-horsea:~$ sudo ps -ef | grep 214551 | grep -v grep ubuntu 214551 214495 0 Jul20 ? 00:00:00 sshd: ubuntu@pts/0 ubuntu 214552 214551 0 Jul20 pts/0 00:00:00 -bash I experienced other messages indicating system degradation such as: - ubuntu@node-horsea:~$ systemctl reload ssh.service Failed to reload ssh.service: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms) See system logs and 'systemctl status ssh.service' for details. - ubuntu@node-horsea:~$ systemctl status ssh.service Failed to get properties: Connection timed out So I did: ubuntu@node-horsea:~$ sudo telinit u ubuntu@node-horsea:~$ sudo systemctl daemon-reexec ubuntu@node-horsea:~$ sudo systemctl daemon-reload And I get then: ubuntu@node-horsea:~$ sudo systemctl status -l 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 Active: inactive (dead) TriggeredBy: × ssh.socket Docs: man:sshd(8) man:sshd_config(5) Jul 20 10:37:30 node-horsea sshd[225140]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. Jul 20 10:37:30 node-horsea sshd[225140]: error: Bind to port 22 on :: failed: Address already in use. Jul 20 10:37:30 node-horsea sshd[225140]: fatal: Cannot bind any address. Jul 20 10:37:30 node-horsea systemd[1]: ssh.service: Main process exited, code=exited, status=255/EXCEPTION Jul 20 10:37:30 node-horsea systemd[1]: ssh.service: Failed with result 'exit-code'. Jul 20 10:37:30 node-horsea systemd[1]: ssh.service: Unit process 1133 (sshd) remains running after unit stopped. Jul 20 10:37:30 node-horsea systemd[1]: Failed to start OpenBSD Secure Shell server. Jul 20 10:54:54 node-horsea sshd[278339]: Accepted publickey for ubuntu from 10.172.195.194 port 49122 ssh2: RSA SHA256:2MSrD9nviIiiRrpcOIF/MA8eD/> Jul 20 10:54:54 node-horsea sshd[278339]: pam_unix(sshd:session): session opened for user ubuntu(uid=1000) by (uid=0) Jul 20 10:54:55 node-horsea sshd[278339]: pam_env(sshd:session): deprecated reading of user environment enabled The process is inactive but alive (I'm logged via ssh, and I was able to make a second connection). And, in a short period of time, the system behaves again the same: ubuntu@node-horsea:~$ systemctl reload ssh.service Failed to get properties: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms) And trying to get the package to a proper installation state still fails: ubuntu@node-horsea:~$ sudo dpkg-reconfigure openssh-server /usr/sbin/dpkg-reconfigure: openssh-server is broken or not fully installed ubuntu@node-horsea:~$ sudo apt upgrade Reading package lists... Done Building dependency tree... Done Reading state information... Done Calculating upgrade... Done # # An OpenSSL vulnerability has recently been fixed with USN-6188-1 & 6119-1: # CVE-2023-2650: possible DoS translating ASN.1 object identifiers. # Ensure you have updated the package to its latest version. # 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] y Setting up openssh-server (1:9.0p1-1ubuntu7.3) ... Replacing config file /etc/ssh/sshd_config with new version Replacing config file /etc/ssh/sshd_config with new version Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install disable ssh rescue-ssh.target is a disabled or a static unit not running, not starting it. Could not execute systemctl: at /usr/bin/deb-systemd-invoke line 145. dpkg: error processing package openssh-server (--configure): installed openssh-server package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: openssh-server Error: Timeout was reached needrestart is being skipped since dpkg has failed E: Sub-process /usr/bin/dpkg returned an error code (1) ubuntu@node-horsea:~$ sudo apt install --fix-broken Reading package lists... Done Building dependency tree... Done Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up openssh-server (1:9.0p1-1ubuntu7.3) ... Replacing config file /etc/ssh/sshd_config with new version Replacing config file /etc/ssh/sshd_config with new version Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install disable ssh rescue-ssh.target is a disabled or a static unit not running, not starting it. Could not execute systemctl: at /usr/bin/deb-systemd-invoke line 145. dpkg: error processing package openssh-server (--configure): installed openssh-server package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: openssh-server needrestart is being skipped since dpkg has failed E: Sub-process /usr/bin/dpkg returned an error code (1)