devstack

Setting up libdbi-perl (1.633-1) ...
Setting up libdbd-mysql-perl (4.028-2) ...
Setting up libterm-readkey-perl (2.33-1) ...
Setting up mysql-client-core-5.6 (5.6.28-0ubuntu0.15.10.1) ...
Setting up mysql-client-5.6 (5.6.28-0ubuntu0.15.10.1) ...
Setting up mysql-server-core-5.6 (5.6.28-0ubuntu0.15.10.1) ...
Setting up mysql-server-5.6 (5.6.28-0ubuntu0.15.10.1) ...
update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
2016-01-29 16:24:22 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-01-29 16:24:22 0 [Note] /usr/sbin/mysqld (mysqld 5.6.28-0ubuntu0.15.10.1) starting as process 23473 ...
Configuring mysql-server-5.6
----------------------------

Unable to set password for the MySQL "root" user

An error occurred while setting the password for the MySQL administrative
user. This may have happened because the account already has a password, or
because of a communication problem with the MySQL server.

You should check the account's password after the package installation.

Please read the /usr/share/doc/mysql-server-5.6/README.Debian file for more
information.