How to Unlock root user in Linux version 4.4

Hi All,
Please let me know how to unlock root user as i tried to access with wrong password more than 3 times.
Thanking you in advance

Hi All,
We tried to reset the root password in single user mode and tried to change the passas follows:
we are getting error message as follows:
sh -3.00#passwd root
Changing password for the user root.
New UNIX password:
Retype New UNIX password:
passwd: Authentication token manipulation error
Please suggest how to change the root password in single user mode

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How to Unlock root user in Linux version 4.4

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