Public bug reported:

My scanner Canon LIDE 20 is reported correctly by xsane and scanimage:

sven@SvenBlack:~$ 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.

found USB scanner (vendor=0x0bda [Generic], product=0x0129 [USB2.0-CRW]) at 
libusb:002:003
found USB scanner (vendor=0x04a9 [Canon], product=0x220d [CanoScan]) at 
libusb:002:002
  # 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.
sven@SvenBlack:~$ sudo scanimage -L
device `plustek:libusb:002:002' is a Canon CanoScan N670U/N676U/LiDE20 flatbed 
scanner

However Gimp reports "no devices found" after "searching for devices"
and SimpleScan shows "failed to scan" when I'm trying to scan.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xsane 0.998-5ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Mar 12 22:44:30 2015
InstallationDate: Installed on 2015-02-17 (23 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 
(20141022.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: xsane
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xsane (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug gnome3-ppa third-party-packages utopic

** Description changed:

  My scanner Canon LIDE 20 is reported correctly by xsane and scanimage:
  
  sven@SvenBlack:~$ 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.
+   # 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.
+   # No SCSI scanners found. If you expected something different, make sure 
that
+   # you have loaded a kernel SCSI driver for your SCSI adapter.
  
  found USB scanner (vendor=0x0bda [Generic], product=0x0129 [USB2.0-CRW]) at 
libusb:002:003
  found USB scanner (vendor=0x04a9 [Canon], product=0x220d [CanoScan]) at 
libusb:002:002
-   # Your USB scanner was (probably) detected. It may or may not be supported 
by
-   # SANE. Try scanimage -L and read the backend's manpage.
+   # 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.
+   # Not checking for parallel port scanners.
  
-   # Most Scanners connected to the parallel port or other proprietary ports
-   # can't be detected by this program.
+   # Most Scanners connected to the parallel port or other proprietary ports
+   # can't be detected by this program.
  sven@SvenBlack:~$ sudo scanimage -L
  device `plustek:libusb:002:002' is a Canon CanoScan N670U/N676U/LiDE20 
flatbed scanner
  
  However Gimp reports "no devices found" after "searching for devices"
- and SimpleScan shows "failed to scan"when I I'm trying to scan.
+ and SimpleScan shows "failed to scan" when I'm trying to scan.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xsane 0.998-5ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Mar 12 22:44:30 2015
  InstallationDate: Installed on 2015-02-17 (23 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 
(20141022.1)
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: xsane
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1431577

Title:
  scan fails with Canon Lide 20

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