You may get the following error while installing Oracle 19c on Oracle Linux 8 in GUI as well as in silent mode.
[oracle@ol8-db-dr dbhome_1]$ ./runInstaller -silent -responseFile /u01/softwares/19c/db_install.rsp Launching Oracle Database Setup Wizard... [WARNING] [INS-08101] Unexpected error while executing the action at state: 'supportedOSCheck' CAUSE: No additional information available. ACTION: Contact Oracle Support Services or refer to the software manual. SUMMARY: - java.lang.NullPointerException [oracle@ol8-db-dr dbhome_1]$
Solution 1: (Temporary):
Export the below variable while runtime and run the runInstaller
Solution 2 (Permanent):
Edit the cvu_config file under $ORACLE_HOME/cvu/admin and change the below line:
# Fallback to this distribution id #CV_ASSUME_DISTID=OEL5
# Fallback to this distribution id CV_ASSUME_DISTID=OEL8
Hope this helps..