Error: While starting the Oracle installation, facing the following issue after change the location as owner getting the same error:

[INS-35951] The installer has detected that there are files in the Oracle Database home (/u01/app/oracle/product/19c/dbhome_1) which are not owned by the user (oracle).

Solution:

1. Switch to root or a sudo-enabled user.

sudo su -

2. Fix ownership recursively

chown -R oracle:oinstall /u01/app/oracle/product/19c/dbhome_1

3. Verify the owner ship

find /u01/app/oracle/product/19c/dbhome_1 \! -user oracle -o \! -group oinstall

4. Re-run the installer as oracle

su - oracle
./runInstaller

Note: I am getting the same error by following this step.

5. Avoid extracting or modifying Oracle files as root

-- Always use the oracle user to unpack the installation files.
-- If you must use root, immediately fix ownership afterward.