*** This bug is a duplicate of bug 1490071 ***
    https://bugs.launchpad.net/bugs/1490071

>From log:

If are sure you want to downgrade to 5.7, remove the file
/var/lib/mysql/debian-*.flag and try installing again.

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https://bugs.launchpad.net/bugs/1672628

Title:
  package mysql-server-5.7 (not installed) failed to install/upgrade:
  subprocess new pre-installation script returned error exit status 1

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