I had the same issue on a fresh install of 16.04, after installing the
brother drivers with their automatic script.
I ran an strace of simple-scan, as recommended by Kuwanger in the IRC,
and found that simple-scan didn't have permission to access some cache
files.
The problem was that simple-scan's cache files were owned by root, and
not accessible by the user. The solution was to run
sudo chown -R ~/.cache/simple-scan
Of course, replace with the name of your user. I hope
that helps!
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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
Status in simple-scan package in Ubuntu:
Confirmed
Bug description:
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/1376300/+subscriptions
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