if you have upgraded your mysql from 5.1 (default) to 5.6 or higher and you get the error when creating new virtual in Webmin administration section like this :
“Please use mysql_upgrade to fix this error. at /usr/libexec/webmin/web-lib-funcs.pl line 1465.”
you can fix this issue like this:
login as root via ssh
and run this command
enter your password and your table privileges should be fixed now.