Thanks for filing this bug in Ubuntu.
The logs show that mysql failed to start because it's missing its configuration
directory:
ERROR: Unable to start MySQL server:
mysqld: Can't read dir of '/etc/mysql/conf.d/' (Errcode: 2 - No such file or
directory)
mysqld: [ERROR] Fatal error in defaults handling. Program aborted!
Did you remove that directory?
Did you switch back and forth between mysql and mariadb?
** Changed in: mysql-5.7 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1791536
Title:
package mysql-server-5.7 5.7.23-0ubuntu0.18.04.1 failed to
install/upgrade: installed mysql-server-5.7 package post-installation
script subprocess returned error exit status 1
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