I have created a DB with user name root and given it a pswd, I am able to log into the mysql monitor performing a sudo mysql -u root -p and then giving password, no error occur , but when I give it the same information on the mybb install wizard it says it can not connect.
see my attachments please
It looks like it could be your Database name or your Database Server Hostname. Verify your database name and then attempt to connect via your IP instead of "localhost".
I changed the DB name to geek and tried connection via the IP instead of local host still can't connect
Create a new user and grant all privileges on *.* to that user. Depending on your setup, root permissions don't permit remote logins and stuff.