# uname -a
Linux improve1 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:36:54 UTC 2017 i686 i686 i686 GNU/Linux

# mysql --version
mysql  Ver 14.14 Distrib 5.7.17, for Linux (i686) using  EditLine wrapper

mysql> CREATE DATABASE bulterm;
ERROR 1044 (42000): Access denied for user 'phpmyadmin'@'localhost' to database 'bulterm'

mysql> SHOW GRANTS FOR 'phpmyadmin'@'localhost';
+--------------------------------------------------------------------+
| Grants for phpmyadmin@localhost                                    |
+--------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'phpmyadmin'@'localhost'                       |
| GRANT ALL PRIVILEGES ON `phpmyadmin`.* TO 'phpmyadmin'@'localhost'  |
+--------------------------------------------------------------------+
2 rows in set (0,00 sec)

sudo systemctl stop mysql
sudo dpkg-reconfigure mysql-server-5.7
sudo systemctl start mysql

sudo gedit /etc/dbconfig-common/phpmyadmin.conf

# dbc_dbuser: database user
#       the name of the user who we will use to connect to the database.
dbc_dbuser='root'

# dbc_dbpass: database user password
#       the password to use with the above username when connecting
#       to a database, if one is required
dbc_dbpass='12345'