[FATAL] [DBT-06103] The port (5,500) is already in use. INFO: Read: ACTION: Specify a free port

Today I was installing oracle 12.2.1 db on Linux server, I got the error message.  

Read: [FATAL] [DBT-06103] The port (5,500) is already in use.
INFO: [FATAL] [DBT-06103] The port (5,500) is already in use.
WARNING: Skipping line: [FATAL] [DBT-06103] The port (5,500) is already in use.
INFO: Read:    ACTION: Specify a free port.
INFO:    ACTION: Specify a free port.
WARNING: Skipping line:    ACTION: Specify a free port.
INFO: Completed Plugin named: Oracle Database Configuration Assistant

Solution: 

edit your /etc/hosts and the entry if you do not have

#ipaddress hostname shotname

xxx.xxx.xxx.xxx example.test.haha example

After I retry the installation it works fine.