[Ubuntu Wiki] Update of "DebuggingPrintingProblems" by till-kamppeter

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The "DebuggingPrintingProblems" page has been changed by till-kamppeter:
http://wiki.ubuntu.com/DebuggingPrintingProblems?action=diff&rev1=85&rev2=86

   3. Attach the input file which you tried to print and tell us with which application you tried to print it.
   4. Attach the data which CUPS receives from the application (section "Capturing print job data" on this page).
   5. Attach the data which the printer receives (section "Getting the data which would go to the printer" on this page)
+  6. Examine the file obtained in the previous step by running the command <<BR>> {{{$ file printout}}} <<BR>> 
-  6. Examine the file obtained in the previous step by running the command <<BR>> {{{$ file printout}}} <<BR>> If it is PostScript or PDF, subscribe "cliddell" (Chris Liddell, Ghostscript upstream developer) to the bug report and also try to display the file on the screen with "evince" and "gs".
+  7. If the file is PostScript or PDF, subscribe "cliddell" (Chris Liddell, Ghostscript upstream developer) to the bug report and also try to display the file on the screen with "evince" and "gs".
-  7. 
+  8. Send the file unfiltered to the printer (as described in the section "Sending a file to the printer unfiltered". You should get the same problem, if you get a different (correct or incorrect) result, there is a problem with the CUPS backend (program which CUPS uses to communicate with the printer hardware).
+  9. If the file is PostScript, try to send uncompressed PostScript. To do so print the file obtained in step (4) with one of the commands <<BR>> {{{$lpr -P <printer> -o psdebug <file>}}} <<BR>> {{{$ lp -d <printer> -o psdebug <file>}}} <<BR>> Repeat the steps (5) - (8) printing this way. See also the file /usr/share/doc/cups-filters/README.gz, section "POSTSCRIPT PRINTING DEBUG MODE".
+  10. As a workaround for the time being you can switch to an alternative program for generating the PostScript which is sent to the printer. Run <<BR>> {{{$ lpadmin -p <printer> -o pdftops-renderer-default=pdftops}}} <<BR>> to switch over and <<BR>> {{{$ lpadmin -p <printer> -R pdftops-renderer-default}}} <<BR>> to switch back. Make sure that you switch back if you follow further instructions from the developers in your bug report, or create a separate print queue for the workaround. See also the file /usr/share/doc/cups-filters/README.gz, section "POSTSCRIPT PRINTING RENDERER AND RESOLUTION SELECTION".
  
  = USB printer does not print or prints garbage =