title: MySQL Community Server 8 doesn`t want to start
body: <p>After I updated the mysql server to version 8.0.3 it wouldn`t start any more. The error.log gives me </p>
  
  <blockquote>
    <p>2018-10-30T19:11:59.014423Z 1 [ERROR] InnoDB: Unsupported redo log format. The redo log was created before MySQL 5.7.9.
    2018-10-30T19:11:59.014489Z 1 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
    2018-10-30T19:11:59.615108Z 1 [ERROR] Failed to initialize DD Storage Engine
    2018-10-30T19:11:59.615582Z 0 [ERROR] Data Dictionary initialization failed.</p>
  </blockquote>
  
  <p>It is not important to fix the mysql server (it would be nice), but I need the data out of the database, but I cannot read the ibdata1 file from /var/lib/mysql. </p>
  
  <p>my server runs on Linux Ubuntu 14.04.5 LTS</p>
  
  <p>Please help me! </p>
  
  <p>Jonas</p>