Hello.

I install printer driver for this device from Canon official site. All is good, and I can print documents. But with scanner situation is bad. I see inSANE project page <http://www.sane-project.org/sane-mfgs.html#Z-CANON>that Canon MF231 is fully supported but system doesn't see any scanner device from USB.

When I check|lsusb|, I get:

|Bus 002 Device 002: ID 8087:8000 Intel Corp. Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:8008 Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 003 Device 004: ID 1c4f:0026 SiGma Micro Keyboard Bus 003 Device 003: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse Bus 003 Device 002: ID 04a9:27d1 Canon, Inc. Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub |

When I enter the command|scanimage -L|:

|No scanners were identified. If you were expecting something different, check that the scanner is plugged in, turned on and detected by the sane-find-scanner tool (if appropriate). Please read the documentation which came with this software (README, FAQ, manpages). |

When I enter:|sudo sane-find-scanner|:

|# sane-find-scanner will now attempt to detect your scanner. If the # result is different from what you expected, first make sure your # scanner is powered up and properly connected to your computer. # No SCSI scanners found. If you expected something different, make sure that you have loaded a kernel SCSI driver for your SCSI adapter. could not fetch string descriptor: Pipe error could not fetch string descriptor: Pipe error found USB scanner (vendor=0x04a9 [Language Error], product=0x27d1 [Language Error]) at libusb:003:002 # Your USB scanner was (probably) detected. It may or may not be supported by SANE. Try scanimage -L and read the backend's manpage. # Not checking for parallel port scanners. # Most Scanners connected to the parallel port or other proprietary ports can't be detected by this program. |

And finally this is report|of apt list libsane-dev -a|:

|libsane-dev/xenial 1.0.27+git20171029-xenial0 amd64 [can be updated: 1.0.25+git20150528-1ubuntu2.16.04.1] libsane-dev/xenial-updates,now 1.0.25+git20150528-1ubuntu2.16.04.1 amd64 [installed, can be updated: 1.0.27+git20171029-xenial0] libsane-dev/xenial 1.0.25+git20150528-1ubuntu2 amd64 |

I read many issues in internet but they very old (since 2007-2011). SANE is fully supported MF231 scan, then why Ubuntu 16.04 (.03 LTS) doesn't see scanner of this device?

Note: Before I made such an installation. But on Ubuntu 17.04. Then there is the same problem but theuser suggested <https://askubuntu.com/questions/952169/canon-i-sensys-mf231/>that not enough package:|libsane-dev|. I install it in Ubuntu 16.04 but no effect.

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