Use this procedure to deinstall the previous release Grid home.

1. Log in as the root user.
2. Manually change the permissions of the previous release Grid home.

   # chmod -R 775 /u01/app/oracle/product/18.0.0/grid
   # chown -R oracle:oinstall /u01/app/oracle/product/18.0.0/grid
   # chown oracle /u01/app/oracle/product/18.0.0

   In this example:

   • /u01/app/oracle/product/18.0.0/grid is the previous release Oracle Grid Infrastructure for a standalone server home

   • oracle is the Oracle Grid Infrastructure installation owner user

   • oinstall is the name of the Oracle Inventory group (OINSTALL group)

   • /u01/app/oracle/product/18.0.0 is the parent directory of the previous Grid home.

3. Log in as the Oracle Grid Infrastructure software owner user (oracle) and run the deinstall command.