*** This bug is a duplicate of bug 1571865 ***
    https://bugs.launchpad.net/bugs/1571865

So effectively this is a change in mysql that no more supports the old 
configuration.
The upgrade path takes care of the most common cases, but some can't be 
automated.

In your older setup you likely had some log entries that mentioned it
being deprecated (as it was in 5.5), but now it stopped being supported
at all.

Please adapt configuration for this (and maybe more) and you should be
fine again.

** This bug has been marked a duplicate of bug 1571865
   mysql fails to start after upgrade if previous defaults were customised

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https://bugs.launchpad.net/bugs/1627224

Title:
  package mysql-server-5.7 5.7.15-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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