On 2019-06-14 7:08 p.m., Gary Dale wrote:
I thought I'd figured it out - that the network printer shouldn't be installed locally, because it's automagically discovered. I tested this by deleting the local install of the network printer and, while it disappears from the CUPS web interface, it still shows up in the list of printers when I try to print a PDF from Okular. This seems somewhat reasonable...On 2019-06-14 7:15 a.m., Brian wrote:Reading over the above output, it struck me that my printer setup wasn't quite what I thought it was, so I went back to basics, deleted the queues on both my workstation and the server, downloaded and installed the Samsung driver on both machines then put the print queues back.On Thu 13 Jun 2019 at 21:31:49 -0400, Gary Dale wrote:On 2019-06-13 5:06 a.m., Brian wrote:[...]Your setup would appear to be: 1. The C410 is connected to a CUPS server via USB (but the connection can also be via wireless).2. The server has the Samsung ULD software installed and is advertisingshared queues. 3. The buster client contacts the server over wireless and is running cups-browsed.Please post what you get with 'lpstat -l -e' from the client. You should be able to recognise your print queue from the output, so follow up with'lpoptions -p <print_queue>'.Not quite. The network connection is wired. The C410 only connects wirelessly using WPS, which I have disabled on the router. $Samsung_C410_Series permanent ipp://localhost/printers/Samsung_C410_Series dnssd://Samsung%20C410%20Series%20(SEC30CDA71CB48A)._printer._tcp.local/Samsung_C410_Series_SEC30CDA71CB48A_ network none ipp://Samsung%20C410%20Series%20(SEC30CDA71CB48A)._ipp._tcp.local/ Samsung_C410_Series_TheLibrarian network noneipps://Samsung%20C410%20Series%20%40%20TheLibrarian._ipps._tcp.local/cupsSamsung_C410_Series_TheLibrarian_3 permanentipp://localhost/printers/Samsung_C410_Series_TheLibrarian_3 file:///dev/nullThe printer is defined on the server (TheLibrarian) twice - once as a network printer and once as a USB printer. It's defined once on myworkstation as a network printer, so I can avoid going through the server.$ lpoptions -p Samsung_C410_Seriescopies=1 device-uri=dnssd://Samsung%20C410%20Series%20(SEC30CDA71CB48A)._printer._tcp.local/ finishings=3 job-cancel-after=10800 job-hold-until=no-hold job-priority=50job-sheets=none,none marker-change-time=1560454516marker-colors=#000000,#00FFFF,#FF00FF,#FFFF00,none,none,none,none,none,none marker-levels=201,178,74,62,89,60,61,89,50,0 marker-names='Black\ Toner\ S/N\ :CRUM-14031169715,Cyan\ Toner\ S/N\ :CRUM-14031169678,Magenta\ Toner\S/N\ :CRUM-14031182177,Yellow\ Toner\ S/N\ :CRUM-14031182186,Transfer\ Roller,Transfer\ Belt,Fuser\ Life,Pick-up\ Roller,Imaging\ Unit,Waste\ Toner'marker-types=toner,toner,toner,toner,other,other,fuser,other,other,other number-up=1 PageSize=Letter printer-commands=none printer-info='Samsung C410Series' printer-is-accepting-jobs=true printer-is-shared=false printer-is-temporary=false printer-location='family room' printer-make-and-model='Samsung C410 Series' printer-state=3 printer-state-change-time=1560454516 printer-state-reasons=none printer-type=2101324 printer-uri-supported=ipp://localhost/printers/Samsung_C410_SeriesVery useful. As confirmation (or not) of an idea, let us have what cupsfilter -p /etc/cups/ppd/<Samsung_C410_Series_ppd> -m printer/foo \ -e --list-filters /etc/nsswitch.conf gives (as root). The line is broken for readability.Now I seem to be able to print from the workstation to the server via the USB connector.I stopped sharing the network connected printer from the server since that really made little sense. Unfortunately I still can't print directly to the network connection. The job gets processed but I just get an error message again.I tried switching to the "driverless" driver but CUPS complained about not being able to copy the PPD file. I noticed an "IPP Anywhere" driver but that produced the same results as the normal driver.The error I got on both print attempts (normal and IPP Anywhere) was:SPL-C ERROR - Disconnected from host. Please check the connection and try again.POSITION : 0x396913 (3762451) SYSTEM : src/os_hook LINE : 1981 VERSION : SPL-C 5.59.01 06-19-2013 This was printed by the printer instead of the output I sent. The lpstat output is now:Samsung_C410_Series permanent ipp://localhost/printers/Samsung_C410_Series ipp://SEC30CDA71CB48A.local:631/ipp/printer Samsung_C410_Series_SEC30CDA71CB48A_ network none ipp://Samsung%20C410%20Series%20(SEC30CDA71CB48A)._ipp._tcp.local/ Samsung_C410_Series_TheLibrarian network none ipps://Samsung%20C410%20Series%20%40%20TheLibrarian._ipps._tcp.local/cups$ lpoptions -p Samsung_C410_Series is now:copies=1 device-uri=ipp://SEC30CDA71CB48A.local:631/ipp/printer finishings=3 job-cancel-after=10800 job-hold-until=no-hold job-priority=50 job-sheets=none,none marker-change-time=1560552544 marker-colors=#000000,#00FFFF,#FF00FF,#FFFF00,none,none,none,none,none,none marker-levels=64,55,55,55,98,94,94,98,93,0 marker-message=marker-message marker-names='Black\ Toner\ S/N\ :CRUM-14031169715,Cyan\ Toner\ S/N\ :CRUM-14031169678,Magenta\ Toner\ S/N\ :CRUM-14031182177,Yellow\ Toner\ S/N\ :CRUM-14031182186,Transfer\ Roller,Transfer\ Belt,Fuser\ Life,Pick-up\ Roller,Imaging\ Unit,Waste\ Toner' marker-types=toner,toner,toner,toner,other,other,fuser,other,other,other number-up=1 PageSize=Letter printer-commands=none printer-info='Samsung C410 Series' printer-is-accepting-jobs=true printer-is-shared=false printer-is-temporary=false printer-location='family room' printer-make-and-model='Samsung C410 Series' printer-state=3 printer-state-change-time=1560552569 printer-state-reasons=cups-ipp-conformance-failure-report,cups-ipp-missing-send-document printer-type=2101324 printer-uri-supported=ipp://localhost/printers/Samsung_C410_SeriesYour latest request fails:cupsfilter -p /etc/cups/ppd/Samsung_C410_Series_ppd -m printer/foo -e --list-filters /etc/nsswitch.confcupsfilter: Unable to open PPD file: Unable to open PPD file on line 0. Segmentation fault root@transponder:~# ls -l /etc/cups/ppd total 512-rw-r----- 1 root lp 192111 Jun 14 18:39 EPSON_Stylus_Photo_R300_TheLibrarian.ppd-rw-r----- 1 root lp 78398 Dec 9 2018 EPSON_XP-820_Series.ppd -rw-r----- 1 root lp 78390 Nov 5 2018 EPSON_XP-820_Series.ppd.O-rw-r----- 1 root lp 43299 Jun 14 18:39 HP_Color_LaserJet_CP1215_TheLibrarian.ppd-rw-r----- 1 root lp 21016 Jun 14 18:39 PDF_TheLibrarian.ppd -rw-r----- 1 root lp 32046 Jun 14 18:40 Samsung_C410_Series.ppd -rw-r----- 1 root lp 32046 Jun 14 18:40 Samsung_C410_Series.ppd.O-rw-r----- 1 root lp 32048 Jun 14 18:39 Samsung_C410_Series_TheLibrarian.ppd
Unfortunately, printing to it does nothing. The output disappears into the ether(net).
To be clear, the printer network connection is there. CUPs lists it multiple times with its network address when I use the web interface to find new printers. And I can ping its IP address.
I then fired up a Stretch VM and tried the same things. Under Stretch, the printer doesn't show up except as the USB-shared printer from the server. However, after installing the Samsung driver, it did show up when I tried to find new printers from the CUPS web interface. I installed it using the SEC30CDA71CB48A "address" and the normal C410 driver and was able to print successfully.
CUPS is apparently working differently in Buster than in Stretch in its handling of network-attached printers.
Anyway, here's my current diagnostic output: $ lpstat -l -eSamsung_C410_Series_SEC30CDA71CB48A_ network none ipp://Samsung%20C410%20Series%20(SEC30CDA71CB48A)._ipp._tcp.local/ Samsung_C410_Series_TheLibrarian network none ipps://Samsung%20C410%20Series%20%40%20TheLibrarian._ipps._tcp.local/cups
$ lpoptions -p Samsung_C410_Series_SEC30CDA71CB48A_device-uri=ipp://Samsung%20C410%20Series%20(SEC30CDA71CB48A)._ipp._tcp.local/ printer-info='Samsung C410 Series (SEC30CDA71CB48A)' printer-location printer-make-and-model='Samsung C410 Series' printer-type=16810060
$ lpoptions -p Samsung_C410_Series_TheLibrariandevice-uri=ipps://Samsung%20C410%20Series%20%40%20TheLibrarian._ipps._tcp.local/cups printer-info='Samsung C410 Series @ TheLibrarian' printer-location='family room' printer-make-and-model=ColorLaserPrinter printer-type=16781390
# cupsfilter -p /etc/cups/ppd/Samsung_C410_Series_TheLibrarian_ppd -m printer/foo -e --list-filters /etc/nsswitch.conf
cupsfilter: Unable to open PPD file: Unable to open PPD file on line 0. Segmentation fault # ls -l /etc/cups/ppd/ total 476-rw-r----- 1 root lp 192111 Jun 14 21:01 EPSON_Stylus_Photo_R300_TheLibrarian.ppd
-rw-r----- 1 root lp 78398 Dec 9 2018 EPSON_XP-820_Series.ppd -rw-r----- 1 root lp 78390 Nov 5 2018 EPSON_XP-820_Series.ppd.O-rw-r----- 1 root lp 43299 Jun 14 21:01 HP_Color_LaserJet_CP1215_TheLibrarian.ppd
-rw-r----- 1 root lp 21016 Jun 14 21:01 PDF_TheLibrarian.ppd-rw-r----- 1 root lp 32048 Jun 14 21:01 Samsung_C410_Series_TheLibrarian.ppd
-rw-r----- 1 root lp 27498 Jun 14 21:07 Samsung_ML_1210_TheLibrarian.ppdChanging the _ppd to .ppd removes the error messages. Instead I get no output.