package:mysql-server-5.7:5.7.23-0ubuntu0.16.04.1
Setting up mysql-server-5.7 (5.7.23-0ubuntu0.16.04.1) ...
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[?25l[?12l[?25hPackage configuration┌────────────────────┤ Configuring mysql-server-5.7 ├─────────────────────┐│ While not mandatory, it is highly recommended that you set a password   │ │ for the MySQL administrative "root" user.                               │ │                                                                         │ │ If this field is left blank, the password will not be changed.          │ │                                                                         │ │ New password for the MySQL "root" user:                                 │ │                                                                         │ │ _________ ______________________________________________________________ │ │                                                                         │ │                                 <Ok>                                    │ │                                                                         │ └─────────────────────────────────────────────────────────────────────────┘                                                                            [?25l<Ok>[?12l[?25h(B

[?1049lupdate-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
Renaming removed key_buffer and myisam-recover options (if present)
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Fri 2018-08-03 20:09:10 IST; 12ms ago
  Process: 20498 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)
  Process: 20497 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)
  Process: 20473 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 20497 (code=exited, status=1/FAILURE)

Aug 03 20:09:10 rjbanna systemd[1]: Failed to start MySQL Community Server.
Aug 03 20:09:10 rjbanna systemd[1]: mysql.service: Unit entered failed state.
Aug 03 20:09:10 rjbanna systemd[1]: mysql.service: Failed with result 'exit...'.
Hint: Some lines were ellipsized, use -l to show in full.
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1