Linux Drop User – Remove a Linux user

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How do I drop or remove old users account from my Linux server? I can login using the user’s SSH access, and run ‘sudo -s’ command to become the root user. How can I remove old account, user’s file and directory ownership on Linux?
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Delete SSH Keys

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One my user leaves the office and I’d like to disable her access to our UNIX / Linux system. How do I delete ssh key from the UNIX systems so that user can not log in?