Hi leyb,

Looking in the logs, mysql is failing because it can't obtain a
lockfile:

2018-11-13T14:17:06.265515Z 0 [ERROR] InnoDB: Unable to lock ./ibdata1 error: 11
2018-11-13T14:17:06.265584Z 0 [Note] InnoDB: Check that you do not already have 
another mysqld process using the same InnoDB data or log files.
2018-11-13T14:17:06.265618Z 0 [Note] InnoDB: Unable to open the first data file
2018-11-13T14:17:06.265652Z 0 [ERROR] InnoDB: Operating system error number 11 
in a file operation.
2018-11-13T14:17:06.265673Z 0 [ERROR] InnoDB: Error number 11 means 'Resource 
temporarily unavailable'
2018-11-13T14:17:06.265687Z 0 [Note] InnoDB: Some operating system error 
numbers are described at 
http://dev.mysql.com/doc/refman/5.7/en/operating-system-error-codes.html
2018-11-13T14:17:06.265701Z 0 [ERROR] InnoDB: Cannot open datafile './ibdata1'
2018-11-13T14:17:06.265738Z 0 [ERROR] InnoDB: Could not open or create the 
system tablespace. If you tried to add new data files to the system tablespace, 
and it failed here, you should now edit innodb_data_file_path in my.cnf back to 
what it was, and remove the new ibdata files InnoDB created in this failed 
attempt. InnoDB only wrote those files full of zeros, but did not yet use them 
in any way. But be careful: do not remove old data files which contain your 
precious data!
2018-11-13T14:17:06.265753Z 0 [ERROR] InnoDB: Plugin initialization aborted 
with error Cannot open a file

Please make sure there aren't other instances accessing that file, and
that its permissions are correct. Another cause could be an unclean
shutdown.


** Changed in: mysql-5.7 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1803141

Title:
  package mysql-server-5.7 5.7.24-0ubuntu0.18.04.1 failed to
  install/upgrade: installed mysql-server-5.7 package post-installation
  script subprocess returned error exit status 1

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