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I don't remember creating one and I'm just trying to print in black and white.

  • Where do you need to enter username/password? Is there a dialog box of some kind? – nohillside Mar 17 '16 at 20:49
  • Please consider selecting the below as a valid answer, it worked for me, I assume it did for you too? – dorien Jun 27 '17 at 4:02
  • @patrix: if you click on adming (localhost:631) it will provide a dialog box. – dorien Jun 27 '17 at 4:03
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Normally you don't need to enter a root username and password to use CUPS. The error is likely to be in /etc/cups/printers.conf You could check the authorization entries in your printers.conf

Even simpler though is that CUPS.org recommends just using your normal admin username and password when asked for authorization:

Use the username and password for your computer.

You will need an account with admin privileges: most OS X computer owners have such an account, it's usually only in an lab or a company where you wouldn't have admin privileges.

I hope this works in your case, Esmeralda. If it doesn't please post some follow up information, such as your printers.conf file.

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