Public bug reported:

I have a Brother MFC-7420 printer/scanner combination device. It was
working when I had Ubuntu 12.04 LTS installed. I have installed the
Brother drivers from the Brother website (brscan2 version 0.2.5-1).

When upgrading to Ubuntu 14.04 LTS scanning stopped working as a normal
user, neither Simple Scan nor Xsane found the scanner. When launching as
root, both were working (e.g. sudo simple-scan).

The problem was related to the scanner device (/dev/usb/lp0) belonging
to the group lp, with normal users having no access permissions to the
device file. When I added my user account to the lp group, it solved the
issue.

Curiously, sane-find-scanner still cannot find my scanner, but scanimage
-L works, as well as simple-scan and xsane.

The same problem has been discussed here, concerning Ubuntu 13.10 (I'm running 
14.04 LTS 64bit):
http://ubuntu.5.x6.nabble.com/xsane-and-simple-scan-only-working-as-root-td5044224.html

** Affects: simple-scan (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- I have a Brother MFC-7420 printer/scanner combination devide. It was
+ I have a Brother MFC-7420 printer/scanner combination device. It was
  working when I had Ubuntu 12.04 LTS installed. I have installed the
  Brother drivers from the Brother website (brscan2 version 0.2.5-1).
  
  When upgrading to Ubuntu 14.04 LTS scanning stopped working as a normal
  user, neither Simple Scan nor Xsane found the scanner. When launching as
  root, both were working (e.g. sudo simple-scan).
  
  The problem was related to the scanner device (/dev/usb/lp0) belonging
  to the group lp, with normal users having no access permissions to the
  device file. When I added my user account to the lp group, it solved the
  issue.
  
  Curiously, sane-find-scanner still cannot find my scanner, but scanimage
  -L works, as well as simple-scan and xsane.
  
  The same problem has been discussed here, concerning Ubuntu 13.10 (I'm 
running 14.04 LTS 64bit):
  
http://ubuntu.5.x6.nabble.com/xsane-and-simple-scan-only-working-as-root-td5044224.html

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https://bugs.launchpad.net/bugs/1376300

Title:
  Scanning works only as root after upgrade to 14.04 LTS, fixable by
  adding user to group lp

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