Pre install steps failing while installing EBS 12.2.6 using startCD51

While in process of installing EBS 12.2.6, the pre steps checks were failing with message:

"Not able to run DB Installer. Check staging area".

Solution-/etc/oraInst.loc file was pointing to wrong location.
Corrected the group and its location.

inventory_loc=

inst_group=

Another change i had to do is, changing the permission of database folder under Techinstallmedia.
(/u01/stage/Techinstallmedia)

chmod -R 777 database

Also the primary group for Oracle user should be dba. If not, then change it
usermod -g dba oracle