I can't recall if CUPS found the printer, or I entered it. I have been living with this problem for a while. I ran the tests. I do not have DNS running, so those commands failed. The other commands worked as expected. Results of lpinfo -v: network socket network http network ipp network ipp14 network lpd serial serial:/dev/ttyS0?baud=115200 network https network ipps direct hp network smb direct hpfax network lpd://192.168.0.20:515/PASSTHRU -- Stephen On 16-05-27 12:12 PM, Allan Zhang wrote:

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Did the printer show up when you wirelessly added it in CUPS, or did you manually add it using the known IP?

Maybe CUPS doesn't see it.

Wiki page here: https://wiki.ubuntu.com/DebuggingPrintingProblems

Relevant part of wiki:

Open a terminal/console and run the commands: $ ping <IP of the printer> $ nmap <IP of the printer> Replace "<IP of the printer>" by the printer's IP address. The first command checks whether you can access the printer through the network, the second shows which port numbers are used by the printer and through this which protocols are active (80: Has web interface, 139: SMB, 443: encrypted IPP or encrypted web interface, 515: LPD, 631: IPP, 9100: JetDirect/AppSocket). Install the "nmap" package if needed.

Run the commands: $ /usr/lib/cups/backend/snmp $ sudo /usr/lib/cups/backend/dnssd The output shows whether the printers get found by CUPS or system-config-printer and with which device URIs and protocols.

Run the command $ /usr/lib/cups/backend/snmp <IP of the printer> if a printer does not get found by the simple "/usr/lib/cups/backend/snmp" call.

Find out if your printer gets detected by CUPS: $ lpinfo -v

- -------- Original Message -------- From: Stephen <stephen-d@rogers.com> Sent: May 27, 2016 11:44:08 AM EDT To: GTALUG Talk <talk@gtalug.org> Subject: [GTALUG] Printing Problem - Can't find printer

I am using Ubuntu 14.04 Printer is Epson WF-2630 Wi-fi connection. Hard coded IP address

When I try to print, I get a Gnome pop-up saying printer is off-line. Using the web interface to CUPS the reported error is printer not found.

I can always ping the printer. I can always print from a windows computer on the same network.

I can, from the CUPS web interface "modify" the printer settings. I click through without changing anything.

When I am finished, the stalled print job is printed.

Any ideas how I can print without "modifying" the printer settings?

- -- Stephen

On 16-05-27 01:39 PM, Kevin Cozens wrote:

...

network socket network http network ipp network ipp14 network lpd serial serial:/dev/ttyS0?baud=115200 network https network ipps direct hp network smb direct hpfax network lpd://192.168.0.20:515/PASSTHRU

lpd sounds like a wired connection (if that is the IP for your printer).

No. This is wifi. But in the router DHCP table I have linked the printer MAC address to IP 192.168.0.20

Running 'lpinfo -v' on my machine with a wireless printer I get: network ipp network ipp14 network socket network ipps serial serial:/dev/ttyS0?baud=115200 network http network https network lpd network smb direct parallel:/dev/lp0 network ipp://192.168.0.109 network socket://[fe80::215:99ff:fe86:9873%eth0] network dnssd://URI_with_printer_name._printer._tcp.local/ network socket://192.168.0.109

In the printer configuration I have Device URI set to "ipp://192.168.0.109". Check the Device URI entry you have set.

I don't see where to set the Device URI. I am looking in the CUPS web interface to set/modify a printer. -- Stephen

On 16-05-27 05:42 PM, Stewart Russell wrote:

Does the printer setup page/screen have an IP address that matches your assigned 192.168.0.20?

Yes

It might also be worth installing Avahi. The printer should auto-discover when you open the add printer dialogue.

The IP address is saved in the configuration. I don't think that finding is the issue. I will park this for now. Also I am not running a DNS. -- Stephen

On 16-05-27 06:07 PM, Kevin Cozens wrote:

On 16-05-27 01:51 PM, Stephen wrote:

...

I don't see where to set the Device URI. I am looking in the CUPS web interface to set/modify a printer.

In Linux Mint 17.2 use the system menus and select System -> Administration -> Printers. You then right click icon for the printer in question, and select Properties. The Device URI will be on the dialog box that pops up under the Settings section.

I am using Gnome, not Mint. My menu goes Applications > System Settings > Printers I click on the Printers icon and see basic read only values. The IP Address is given as localhost. :( I went back to the CUPS admin web interface and confirmed that CUPS has the printer IP as 192.168.0.20:515 -- Stephen