Thanks for filing this bug in Ubuntu.
Unfortunately it's unclear from the logs why mysql wasn't running.
Could you try the following command and see if the error happens again,
and then one more time attach /var/log/mysql/* please?
sudo apt update
sudo apt install --reinstall mysql-server-5.7
** Changed in: mysql-5.7 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1702074
Title:
package mysql-server-5.7 5.7.18-0ubuntu0.16.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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