INS-30060: Check for group existence failed.

Install Oracle 11gR2 on RHEL5 issue

solution

./runInstaller -ignoreSysPrereqs –ignoreInternalDriverError

Reference:
Cause: Unexpected error occurred while trying to check for group existence.
Action: Refer to the logs or contact Oracle Support Services. Note for advanced users: Launch the installer by passing the following flag ‘-ignoreInternalDriverError’.