Hi,
that error seems odd, it is usually when a executable can not be executed due 
to e.g. wrong architecture.

Could you run and report back the following things:
$ dpkg --print-architecture
$ dpkg --print-architectures
$ uname -a
$ file /usr/local/bin/mysqld

Also the path indicated that this is not a normal Ubuntu mysql - that would 
have been in /usr/sbin/mysqld
So please report:
$ dpkg -S /usr/sbin/mysqld

If no package is owning this then you have some sort of third party mysql that 
is not supported.
If unintentionally there remove it, generally ../local/... takes precedence 
over other paths so the startup might pick this broken one up unintentionally.

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

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https://bugs.launchpad.net/bugs/1685663

Title:
  package mysql-server-5.7 5.7.17-0ubuntu0.16.04.2 failed to
  install/upgrade: подпроцесс установлен сценарий post-installation
  возвратил код ошибки 126

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