sudo dpkg --configure openssh-server

Setting up openssh-server (1:7.2p2-4ubuntu2.8) ...
Unsafe symlinks encountered in /var/run/sshd, refusing.
Job for ssh.service failed because the control process exited with error code. See "systemctl status ssh.service" and "journalctl -xe" for details.
invoke-rc.d: initscript ssh, action "start" failed.
● ssh.service - OpenBSD Secure Shell server
   Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Thu 2020-02-06 17:31:45 +04; 86ms ago
  Process: 8987 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=255)

Feb 06 17:31:45 chbpc-VirtualBox systemd[1]: ssh.service: Control process exited, code=exited status=255
Feb 06 17:31:45 chbpc-VirtualBox systemd[1]: Failed to start OpenBSD Secure Shell server.
Feb 06 17:31:45 chbpc-VirtualBox systemd[1]: ssh.service: Unit entered failed state.
Feb 06 17:31:45 chbpc-VirtualBox systemd[1]: ssh.service: Failed with result 'exit-code'.
dpkg: error processing package openssh-server (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 openssh-server