Run the parallel port CUPS backend separately, once with standard user privileges and once as root: $ sudo cat /proc/sys/dev/parport/parport*/autoprobe* $ ls -l /proc/sys/dev/parport/parport*/autoprobe* Open a terminal/console and check if the lp, ppdev, and parport_pc kernel modules are loaded:Ĭheck if the kernel detected the parallel port during bootup:Ĭheck if the device files of the parallel port(s) are created and have the correct permissions and ownerships:Ĭheck if the printer auto-detection result appears in the kernel's virtual file system: Note that problems cannot only caused by CUPS but also by the kernel (package "linux"), libusb, HPLIP (package "hplip"), and several third-party printer drivers. Attach the output of the above commands to the bug report.)įind out if your printer gets detected by CUPS: The numbers must be supplied with three digits, zero-padded from the left, like "008:015". Replace "" and "" by the bus and device numbers from the "lsusb" output (not vendor and product ID). Please re-run this command if needed.Ĭheck whether the device files for the printer get created and the ownerships ("root lp") and permissions (non-HP: "crw-rw-r-", HP: "crw-rw-r-+") correctly set:ĭetermine the printer's device ID strings:Īnd choose the printer with the problem from the text menu, then copy the "deviceid" entry from the output (can be several lines).įor HP printers: Check that you have the latest version of HPLIP and whether HPLIP connects to them: Note: The USB bus and device addresses change if you turn off or unplug the printer. Reconnect the USB printer cable, you should see some messages appearing.Ĭheck whether the printer gets correctly detected by the USB subsystem and determine its USB vendor/product IDs and the USB bus and device addresses:.Unplug the USB printer cable from your computer and enter this command: Open a terminal/console and check if the usb kernel modules are loaded: Make sure that the printer is connected to your system and powered on.NOTE: If you have a USB -> Parallel adapter, proceed as for a USB printer and also see the "USB -> Parallel adapter" section below.
You can also add the information after the bug is reported by executing 'apport-collect -p cups BUGNUMBER' where BUGNUMBER is the bug report you want to add information to. To report printing bugs preferably use 'ubuntu-bug cups' from a terminal window which will gather useful information about your system related to printing like the version of Ubuntu you use, configured printers and the versions of important printing packages installed and automatically attach them to your bug report.
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