Did you pay attention to the error messages in your terminal?

The log shows you clicked OK after this dialog:
> The file /var/lib/mysql/debian-5.7.flag indicates a
> version that cannot automatically be upgraded. Therefore the
> previous data directory will be renamed to /var/lib/mysql-5.7 and
> a new data directory will be initialized at /var/lib/mysql.
> Please manually export/import your data (e.g. with mysqldump) if needed.

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https://bugs.launchpad.net/bugs/1683229

Title:
  package mariadb-server-10.1 (not installed) failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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