When meet the problem that can't access the phpmyadmin with "http://xx.xx.xx.xx/phpmyadmin
the problem could be caused by the following
1) mysql isn't started up
--> use this command to up mysql "sudo /etc/init.d/mysql start"
--> check whether mysql is up or not "mysql -h 127.0.0.1 -P 3306 -u root -p
2)apache2 dosn't up
--> to start apache2 with command "sudo /etc/init.d/mysql start"
3) phpmyadmin doesn't configure properly
-->reconfigure it with command "sudo dpkg-reconfigure phpmyadmin"