从下载的 deb 和 apt 安装 MySQL 5.6 时出现错误：
nginx@LBNginx:/tmp$ sudo dpkg -i mysql-server-5.6_5.6.27-0ubuntu0.14.04.1_amd64.deb
(Reading database ... 121037 files and directories currently installed.)
Preparing to unpack mysql-server-5.6_5.6.27-0ubuntu0.14.04.1_amd64.deb ...
Unpacking mysql-server-5.6 (5.6.27-0ubuntu0.14.04.1) over (5.6.27-0ubuntu0.14.04.1) ...
Setting up mysql-server-5.6 (5.6.27-0ubuntu0.14.04.1) ...
2015-10-27 19:31:17 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-10-27 19:31:17 0 [Note] /usr/sbin/mysqld (mysqld 5.6.27-0ubuntu0.14.04.1) starting as process 7666 ...
2015-10-27 19:31:17 7666 [Note] Plugin 'FEDERATED' is disabled.
2015-10-27 …