title: Issues on reinstalling MySQL 5.7 server on Ubuntu 16.04
body: <p>My server is running on Ubuntu 16.04
  I hade some issue with my MySQL configuration, so I've decided to clean up and reinstall the MySQL server.</p>
  
  <p>After this command: </p>
  
  <pre><code>sudo apt-get install mysql-server
  </code></pre>
  
  <p>This is what i got at the end of the process:</p>
  
  <pre><code>update-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.
  dpkg: error processing package mysql-server-5.7 (--configure):
   subprocess installed post-installation script returned error exit status 1
  Setting up libhtml-tagset-perl (3.20-2) ...
  Setting up liburi-perl (1.71-1) ...
  Setting up libhtml-parser-perl (3.72-1) ...
  Setting up libcgi-pm-perl (4.26-1) ...
  Setting up libfcgi-perl (0.77-1build1) ...
  Setting up libcgi-fast-perl (1:2.10-1) ...
  Setting up libencode-locale-perl (1.05-1) ...
  Setting up libhtml-template-perl (2.95-2) ...
  Setting up libtimedate-perl (2.3000-2) ...
  Setting up libhttp-date-perl (6.02-1) ...
  Setting up libio-html-perl (1.001-1) ...
  Setting up liblwp-mediatypes-perl (6.02-1) ...
  Setting up libhttp-message-perl (6.11-1) ...
  dpkg: dependency problems prevent configuration of mysql-server:
   mysql-server depends on mysql-server-5.7; however:
    Package mysql-server-5.7 is not configured yet.
  
  dpkg: error processing package mysql-server (--configure):
   dependency problems - leaving unconfigured
  No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                            Processing triggers for libc-bin (2.23-0ubuntu5) ...
  Processing triggers for systemd (229-4ubuntu13) ...
  Processing triggers for ureadahead (0.100.0-19) ...
  Errors were encountered while processing:
   mysql-server-5.7
   mysql-server
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  </code></pre>
  
  <p>I try to start the MySQL and running <code>systemctl status mysql.service</code> gave this:</p>
  
  <pre><code>● mysql.service - MySQL Community Server
     Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
     Active: activating (start-post) (Result: exit-code) since Tue 2016-12-20 17:33:32 BDT; 14s ago
    Process: 22634 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)
    Process: 22631 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
   Main PID: 22634 (code=exited, status=1/FAILURE);         : 22635 (mysql-systemd-s)
      Tasks: 2
     Memory: 1.5M
        CPU: 337ms
     CGroup: /system.slice/mysql.service
             └─control
               ├─22635 /bin/bash /usr/share/mysql/mysql-systemd-start post
               └─22669 sleep 1
  </code></pre>
  
  <p>When I try to connect the database using <code>mysql -u root -p</code></p>
  
  <pre><code>ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
  </code></pre>