INS-08101 Unexpected error while executing the action at state: ‘supportedOSCheck’

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

export CV_ASSUME_DISTID=OEL7.6

Solution 2 (Permanent):

Edit the cvu_config file under $ORACLE_HOME/cvu/admin and change the below line:

from

# Fallback to this distribution id
#CV_ASSUME_DISTID=OEL5

to

# Fallback to this distribution id
CV_ASSUME_DISTID=OEL8

Hope this helps..