Unable to install any software or access kuser

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I've just installed RHEL 7.6. I've installed Base environment: Server with GUI with all add-ons for selected environment

During Installation I created Root Password & created user form User Creation with, "Make this user administrator" option

Now, post install & after successful login to RHEL environment, I'm unable to install any software or access KUser to edit user permission or change user group

While installing anything it gives error - "something went wrong", Error msg when trying to use KUser - "Error opening /etc/shadow for reading"

How to give root permissions to user created during Installation?

HK

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