After clonning (or installing) an Oracle Applications Release 12.0 or 12.1 instance on Linux 5, an error may occur while starting up the Apache service. The error would be this:

You are running version 120.6.12000000.4
Starting OPMN managed Oracle HTTP Server (OHS) instance ... exiting with status 204

Review the HTTP log file. It shows :

libraries: cannot open shared object file: No such file or directory

Soft link is missing.
To solve this issue,

- Shut down all Oracle Application Services

- As root user, create a soft link as follows:
# ln -s /usr/lib/ /usr/lib/

- Start up all Oracle Application Services