Mysqladmin not updating privileges for
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NOTE: Changing the grants on your "admin" user could potentially lock you out of your Plesk Control Panel.
If you are just looking for a quick fix how to reset a My SQL root password you can find that at the bottom of this tutorial.
The first prompt will inquire that whether you want to set up any password plugin to examine the strength of My SQL password given by you.If required, following step 3 you can adjust this setting. Is this tutorial on how to install My SQL on Ubuntu helpful?