lppasswd: Unable to open passwd file: Permission denied
The lppasswd command used to adds, changes, or deletes passwords in the CUPS digest password file which refer to /etc/cups/passwd.md5.
In order to create a new CUPS administrator user, enter a command: lppasswd -g sys -a username.
I’m having a problem creating a new user with error message: “lppasswd: Unable to open passwd file: Permission denied” today.

And I just would like to share the solution as below:
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