Thanks for filing this bug in Ubuntu.
No idea what happened:
2018-08-25T04:40:38.044455Z 4 [ERROR] InnoDB: Operating system error number 17
in a file operation.
2018-08-25T04:40:38.044493Z 4 [ERROR] InnoDB: Error number 17 means 'File
exists'
2018-08-25T04:40:38.044505Z 4 [Note] InnoDB: Some operating system error
numbers are described at
http://dev.mysql.com/doc/refman/5.7/en/operating-system-error-codes.html
2018-08-25T04:40:38.044515Z 4 [ERROR] InnoDB: Cannot create file
'./mysql/innodb_table_stats.ibd'
2018-08-25T04:40:38.044525Z 4 [ERROR] InnoDB: The file
'./mysql/innodb_table_stats.ibd' already exists though the corresponding table
did not exist in the InnoDB data dictionary. Have you moved InnoDB .ibd files
around without using the SQL commands DISCARD TABLESPACE and IMPORT TABLESPACE,
or did mysqld crash in the middle of CREATE TABLE? You can resolve the problem
by removing the file './mysql/innodb_table_stats.ibd' under the 'datadir' of
MySQL.
2018-08-25T04:41:14.564124Z 6 [ERROR] InnoDB: Table
`mysql`.`innodb_table_stats` not found.
2018-08-25T04:41:14.564157Z 6 [ERROR] InnoDB: Fetch of persistent statistics
requested for table `badincdailylogs2018`.`important_info` but the required
system tables mysql.innodb_table_stats and mysql.innodb_index_stats are not
present or have unexpected structure. Using transient stats instead.
2018-08-25T04:46:12.616491Z 61 [ERROR] InnoDB: Table
`mysql`.`innodb_table_stats` not found.
2018-08-25T04:46:12.616538Z 61 [ERROR] InnoDB: Fetch of persistent statistics
requested for table `blueclub-insight`.`tbl_admin_user` but the required system
tables mysql.innodb_table_stats and mysql.innodb_index_stats are not present or
have unexpected structure. Using transient stats instead.
2018-08-25T04:46:12.631123Z 61 [ERROR] InnoDB: Table
`mysql`.`innodb_table_stats` not found.
2018-08-25T04:46:12.631159Z 61 [ERROR] InnoDB: Fetch of persistent statistics
requested for table `blueclub-insight`.`tbl_log_admin` but the required system
tables mysql.innodb_table_stats and mysql.innodb_index_stats are not present or
have unexpected structure. Using transient stats instead.
Maybe different directories were specified, and that broke the mysql
upgrade script?
** Changed in: mysql-5.7 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1788983
Title:
package mysql-server-5.7 5.7.23-0ubuntu0.16.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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