UIM install fails with "the system does not have a valid hostname mapping".

Document ID : KB000098365
Last Modified Date : 29/05/2018
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Issue:
UIM install fails with:
System Prerequisites Analysis -----------------------------
PRESS TO TEST SYSTEM PREREQUISITES:
[1/6] Operating System ... - OK
[2/6] Available Memory ... - OK
[3/6] CPU Count ... - OK
[4/6] Disk Space ... - OK
[5/6] Compatibility Libraries ... - OK
[6/6] Host IP ... - Error ERROR:
The system does not have a valid hostname mapping.
Edit the /etc/hosts file and test again. 
 
Environment:
UIM Server install on Linux. 
Resolution:
Hosts file had: 
127.0.0.1     localhost 
10.10.10.10 server-one-usa  server-one.ix.our.domain

the 'hostname' and 'uname -n' commands returned: server-one.our.domain

updated hosts to 
10.10.10.10 server-one-usa  server-one.our.domain