*** This bug is a duplicate of bug 1612517 ***
https://bugs.launchpad.net/bugs/1612517
>From log:
ERROR: Unable to start MySQL server:
2016-10-04T12:06:42.745709Z 0 [ERROR] unknown variable 'thread_concurrency=8'
2016-10-04T12:06:42.749777Z 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.
dpkg: error processing package mysql-server-5.7 (--configure):
subprocess installed post-installation script returned error exit status 1
** This bug has been marked a duplicate of bug 1612517
Server fails to start after upgrade because of customized config and
obsolete/renamed directives
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https://bugs.launchpad.net/bugs/1630219
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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