Preparing to unpack .../ubuntu-desktop_1.361.4_amd64.deb ...
Unpacking ubuntu-desktop (1.361.4) over (1.361.4) ...
Setting up mysql-server-5.7 (5.7.31-0ubuntu0.16.04.1) ...
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 2020-08-21 10:06:29 IST; 10ms ago
  Process: 6207 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)
  Process: 6206 ExecStart=/usr/sbin/mysqld (code=exited, status=3)
  Process: 6184 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 6206 (code=exited, status=3)

Aug 21 10:06:29 suchit systemd[1]: Failed to start MySQL Community Server.
Aug 21 10:06:29 suchit systemd[1]: mysql.service: Unit entered failed state.
Aug 21 10:06:29 suchit 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