First, check which Oracle edition is installed using this query:
select * from product_component_version;
Make sure it is not running Oracle Express edition, which Veeam Backup & Replication does not support when it is run on Linux.
If you are on a supported edition, you may need to re-link the Oracle libraries.
You can relink the product executables manually by using the relink shell script located in the $ORACLE_HOME/bin directory. You must relink the product executables every time you apply an operating system patch or after an operating system upgrade.
Navigate to $ORACLE_HOME/bin directory and run “relink”