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accessibility issues (correct/wrong setup in cupsd.conf or its bad interpretation by cupsd daemon, bad cooperation with NIS, SSSD...),
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Identifying your problem area
Printing issues can be fairly complex and active cooperation or lots of data can be requested from reporter by maintainer to helping maintainer to at least understand and (if it is not hardware specific issue) reproduce the issue, so please have a patience and try to narrow the problem as much you are able to for maintainers.
There can be:
issues with seeing or connecting to the printer (it can be cups backend issues, avahi issues, libusb issues, cups-browsed issues),
accessibility issues (correct/wrong setup in cupsd.conf or its bad interpretation by cupsd daemon, bad cooperation with NIS, SSSD...),
printing with help of samba (issues with smb backend, which is part of samba) or with samba authenticated through Kerberos (samba_krb5_printing),
issues with filters used during filtering the document into document format supported by printer, which influence how or if the document will be printed (issue with filters - pdftops, pdftopdf, pstops, bannertopdf etc. - or issues with binaries or libraries which filters uses - libgs, qpdf, poppler...),
issues with Postscript Printer Description files, which are old way of defining printers capabilities like supported page sizes, borders etc...
Not mentioning possible limitations or issues in firmware or hardware of printer itself, so any kind of data or narrowing the issue is welcomed.
The best start is to attach files with logs described further down.
CUPS logging
All CUPS logging is redirected to journal by default since Fedora 28 (there was a redirecting of error_log to journal by default before Fedora 28).
We need to define two different ways of capturing incident-bound CUPS whole logs - the one if the broken print queue isn't provided by HPLIP and the other if it is. They differs in the filter option of journald - if you use non-HPLIP queue for debugging, it is okay to gather the logs from cups systemd unit (by '-u cups'), because all error messages are correctly redirected to cups systemd unit logging and they are accessible in the output after unit filtering. HPLIP libraries are not implemented to do the same (upstream is unresponsive to accept a potencial fix into the project and the issue is not critical enough to drag a downstream patch forever), so their messages aren't marked for cups systemd unit and they're filtered out after calling journald with '-u cups'. For such queues journald log without filtering is required.
Incident-bound journald log without filtering is required only for HPLIP print queues (their device uri starts with hp://) and it is unwanted for other queues, because it can be hard to read in larger cases. Please attach incident-bound journald log only when it is necessary.
Location of CUPS logging
CUPS logging is located in the system journal by default, but the logging into a file can be set in [filename]`/etc/cups/cups-files.conf` with directive [option]`ErrorLog`. If you want to change the default settings, then the name of the logging file is irrelevant, but it is recommended to put the file into path `/var/log/cups`, otherwise SELinux will block cupsd from accessing it.
Setting the logging to a file has following cons (without further operations):
unable to get only logs connected to a job without chaining more commands
unable to get logs for specified time frame without chaining more commands
For capturing a incident-bound logs `tail -f` can be used e.g.:

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accessibility issues (correct/wrong setup in cupsd.conf or its bad interpretation by cupsd daemon, bad cooperation with NIS, SSSD...),
accessibility issues (correct/wrong setup in cupsd.conf or its bad interpretation by cupsd daemon, bad cooperation with NIS, SSSD...),
a year ago
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15131533 String information

Source string description
type: Plain text
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read-only
Source string location
./partialsdelete/2delete-proc_cups-identifying-your-problem-area.adoc:10
String age
a year ago
Last updated
a year ago
Source string age
a year ago
Translation file
pot/master/partialsdelete/2delete-proc_cups-identifying-your-problem-area.pot, string 5