After thrice attempts, I finally successfully completed the task Selinux Installation at https://engineer.kodekloud.com/practice. Since it is not straightforward, I posted here. > sudo yum install -y selinux* > # SELINUX=disabled > # change SELINUX in /etc/selinux/config > cat /etc/selinux/config | grep SELINUX # SELINUX= can take one of these three values: SELINUX=disabled # SELINUXTYPE= can take one of three values: SELINUXTYPE=targeted