>As Paul said & others as well elsewhere on the internet, some have had success 
>with workarounds where I have not. >Could this be some combination of 
>downloaded software that is causing this?
Well, I see it like keeping adding the said line is a symptom.
The authentication error that triggers the symptom can be slightly different 
for each user.

>If all my PCs are running Ubuntu 9.04 do I need Samba to share printers & 
>files?
no, CUPS should be fine.

After applying the workaround, where you able to print once?

I suggest that:
1) You apply the said workaround:
lpadmin -p <printer_name> -o auth-info-required=none

2)In Ubuntu Gutsy or newer, select "System" -> "Administration" ->
"Printing" in the main menu of your desktop. The printer setup tool
system-config-printer will open.

3)Go to the troubleshooting wizard in system-config-printer. You find it
by in the "Help" menu of system-config-printer. It produces a text file
with a lot of useful information to attach to bug reports. Follow the
instructions of the wizard. If you reach the test page step, you can
either click the button to print the test page or you can print a job to
the selected printer from any application or from the command line. The
job will be shown in the integrated job viewer. Wait until it completes
or goes into "Stopped" state. ONLY THEN AND NOT BEFORE mark the checkbox
at the job, answer whether the job got printed correctly, and click
"Forward". After that the file will get generated. Save it and attach it
to this bug report.

[Step 3 were taken from
https://wiki.ubuntu.com/DebuggingPrintingProblems#Troubleshooting%20Wizard
]

-- 
cups says "can't promp for authorization" when printing to my samba printer
https://bugs.launchpad.net/bugs/283811
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