While upgrading an Oracle instance from 22.214.171.124 to 126.96.36.199, through DBUA I discovered a bug. If the unix uid of the oracle user is 9 digit, DBUA refuses to recognize oracle as the unix owner of the software. This issue doesn't occur with older oracle ids which were 5 digit. We got a similar issue in past with runInstaller for which an SR was logged and Oracle opened bug 10205927. For the current issue with DBUA, I have logged a new SR
Till this bug is fixed by Oracle, DBUA will fail for any instance whose oracle user has unix uid of 9 digit. All upgrades to 188.8.131.52 on such instances will have to use the manual upgrade process.
I'll update this post with more details, after Oracle responds on the SR.