Node not found Error while running the Database installer on Linux server

This error is happening if the /etc/hosts file does not contain an entry of your server.

Append your server entry in the following format

IPADDRESS<space> HOSTNAME<space>ANY_ LOGICAL_NAME_FOR_HOSTNAME

[oracle@fmw12c windowsdrive]$ cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
10.0.2.15 yourhostname yourhostname