It means that either the database name you specified is incorrect or doesn’t exist, or that the user you specified doesn’t have permissions to access it.
It’s important to focus on the entire message:
Can’t select database
We were able to connect to the database server (which means your username and password is okay) but not able to select the xxxxxxx database.
- Are you sure it exists?
- Does the user xxxxxx have permission to use the xxxxxxx database?
- On some systems the name of your database is prefixed with your username, so it would be like username_xxxxxxx. Could that be the problem?
If you don’t know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.
What do you find when you check the listed suggestions?
