udev-configure-printer[595]: unable to access /sys/devices/pci0000:00/0000:00:14.0/usb1/1x2d8

[dino99]

Errors logged into journalctl:

initialisation (as expected):
 kernel: usb 1-8: new high-speed USB device number 3 using xhci_hcd
 kernel: usb 1-8: New USB device found, idVendor=04a9, idProduct=1774
 kernel: usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3
 kernel: usb 1-8: Product: MX470 series
 kernel: usb 1-8: Manufacturer: Canon
 kernel: usb 1-8: SerialNumber: 274317
...
is related or not:
 systemd[1]: systemd-udevd.service: Job systemd-hwdb-update.service/start deleted to break ordering cycle starting with systemd-udevd.service/start
...
 systemd-udevd[287]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
 systemd[1]: Created slice system-udev\x2dconfigure\x2dprinter.slice.
...
 kernel: usblp 1-8:1.1: usblp0: USB Bidirectional printer dev 3 if 1 alt 0 proto 2 vid 0x04A9 pid 0x1774
 kernel: usblp 1-8:1.2: usblp1: USB Bidirectional printer dev 3 if 2 alt 0 proto 2 vid 0x04A9 pid 0x1774
 kernel: usbcore: registered new interface driver usblp
 systemd-udevd[287]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
...
 udev-configure-printer[595]: add /devices/pci0000:00/0000:00:14.0/usb1/1x2d8
 udev-configure-printer[595]: unable to access /sys/devices/pci0000:00/0000:00:14.0/usb1/1x2d8
...
 systemd[1]: Started Make remote CUPS printers available locally.
...
systemd[1]: udev-configure-printer@-devices-pci0000:00-0000:00:14.0-usb1-1x2d8.service: Control process exited, code=exited status=1
systemd[1]: udev-configure-printer@-devices-pci0000:00-0000:00:14.0-usb1-1x2d8.service: Failed with result 'exit-code'.
systemd[1]: Failed to start Automatic USB/Bluetooth printer setup (-devices-pci0000:00-0000:00:14.0-usb1-1x2d8).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: system-config-printer-udev 1.5.9+20170825-0ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CupsErrorLog:

CurrentDesktop: GNOME
Date: Sat Nov 4 10:52:14 2017
Lpstat: matériel pour MX470 : usb://Canon/MX470%20series?serial=274317&interface=1
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 04a9:1774 Canon, Inc.
 Bus 001 Device 002: ID 046d:c062 Logitech, Inc. M-UAS144 [LS1 Laser Mouse]
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
Papersize: letter
PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/MX470.ppd'] failed with exit code 2: grep: /etc/cups/ppd/MX470.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic root=UUID=30e90528-4140-4821-932f-5111f0638c9c ro
SourcePackage: system-config-printer
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/07/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P7.00
dmi.board.name: B150M-HDV
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP7.00:bd10/07/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB150M-HDV:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

[dino99 (9d9)]

PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/MX470.ppd'] failed with exit code 2: grep: /etc/cups/ppd/MX470.ppd: Permission denied

[dino99 (9d9)]

 ls -l /etc/cups/ppd/*
-rw-r----- 1 root lp 128K oct. 27 20:48 /etc/cups/ppd/MX470.ppd
-rw-r----- 1 root lp 128K oct. 27 06:28 /etc/cups/ppd/MX470.ppd.O