package:openssh-server:1:7.2p2-4ubuntu2.4
Setting up openssh-server (1:7.2p2-4ubuntu2.4) ...
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 "restart" failed.
● ssh.service - OpenBSD Secure Shell server
   Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2018-02-20 06:34:34 IST; 5ms ago
  Process: 16848 ExecStart=/usr/sbin/sshd -D $SSHD_OPTS (code=exited, status=255)
 Main PID: 16848 (code=exited, status=255)

Feb 20 06:34:34 mahendra-Satellite-P75-A systemd[1]: Starting OpenBSD Secure ...
Hint: Some lines were ellipsized, use -l to show in full.
dpkg: error processing package openssh-server (--configure):
 subprocess installed post-installation script returned error exit status 1