*** This bug is a duplicate of bug 1571865 ***
https://bugs.launchpad.net/bugs/1571865
>From the log:
Renaming removed key_buffer and myisam-recover options (if present)
ERROR: Unable to start MySQL server:
2016-09-24T01:27:57.868365Z 0 [ERROR] unknown variable
*** 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
** Tags removed: need-duplicate-check
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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
