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Allowing passwordless sudo removes an important security layer. Only apply this to trusted user accounts on machines you control.
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Open /etc/sudoers with visudo
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Always use visudo to edit the sudoers file — it validates the syntax before saving, which prevents locking yourself out.
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sudo visudo
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Add the NOPASSWD entry
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Append the following line at the end of the file, replacing kc with your actual username:
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# User privilege specification
root    ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

@includedir /etc/sudoers.d
kc      ALL=(ALL:ALL) NOPASSWD:ALL
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Test the configuration
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Open a new terminal window and run a command that requires root privileges:
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sudo apt-get update
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You should not be prompted for a password.

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