Hi and thanks for your report and helping to make Ubuntu better.

>From the log:
ERROR: Unable to start MySQL server:
2016-09-09T20:35:10.966422Z 0 [ERROR] unknown variable 'table_cache=32'
2016-09-09T20:35:10.970765Z 0 [ERROR] Aborting
Please take a look at https://wiki.debian.org/Teams/MySQL/FAQ for tips on 
fixing common upgrade issues.
Once the problem is resolved, run apt-get --fix-broken install to retry.


The TL;DR of this is that the newer mysql doesn't support one of the options 
that you had in your old configuration. The installation helpers tried to take 
care of the more common ones, but for others users have to evaluate and fix the 
config themselve.

Since it seems likely to me that this is a local configuration problem, rather 
than a bug in Ubuntu, I'm marking this bug as Incomplete.
Please reopen if you think this is a real bug after trying to fix your 
configuration for the new version.

** Changed in: mysql-5.7 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1622015

Title:
  package  mysql-server-5.7 5.7.13-0ubuntu0.16.04.2 failed to
  install/upgrade: subprocess installed post-installation script re
  turned error exit status 1

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