[FATAL] [INS-30024] Installer has detected that the location determined as Oracle Grid Infrastructure home is not a valid Oracle home

Issue:

[INS-30024] Installer has detected that the location determined as Oracle Grid Infrastructure home, is not a valid Oracle home.
Cause:

Due to failed previous grid installation.

Solution:

Rename olr.loc and ocr.loc and unset the oracle related variables and re-run the installation
mv /etc/oracle/olr.loc /etc/oracle/olr.loc_orig
mv /etc/oracle/ocr.loc /etc/oracle/ocr.loc_orig
$unset ORACLE_HOME
$unset ORACLE_BASE
$unset ORACLE_SID
$unset ORA_CRS_HOME