ERROR: 1062 Duplicate entry ‘localhost-root’ for key 1

MySql Server installation fails when your host name is localhost you will get the “ERROR: 1062  Duplicate entry ‘localhost-root’ for key 1” or “ERROR: 1062  Duplicate entry ‘localhost-‘ for key 1”
Simple solution is
Use the command hostname to give your system a host name and also change host name  in the configuration file /etc/sysconfig/network
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