Trying to scan using a cannon MP160 reports "unable to connect to the
scanner".   If I run sudo simple-scan -d it works beautifully,
suggesting there are permission issues somewhere.   Below is the output
of the non-sudo attempt.  Please point me in the right direction as to
what permissions to change where.

** (simple-scan:8280): DEBUG: Starting Simple Scan 1.0.3, PID=8280
** (simple-scan:8280): DEBUG: Restoring window to 600x400 pixels
** (simple-scan:8280): DEBUG: sane_init () -> SANE_STATUS_GOOD
** (simple-scan:8280): DEBUG: SANE version 1.0.20
** (simple-scan:8280): DEBUG: Requesting redetection of scan devices
** (simple-scan:8280): DEBUG: Processing request
** (simple-scan:8280): DEBUG: sane_get_devices () -> SANE_STATUS_GOOD
** (simple-scan:8280): DEBUG: Device: name="pixma:04A91714" vendor="CANON" 
model="Canon PIXMA MP160" type="multi-function peripheral"
** (simple-scan:8280): DEBUG: Requesting scan at 300 dpi from device 
'pixma:04A91714'
** (simple-scan:8280): DEBUG: scanner_scan ("pixma:04A91714", 300, SCAN_SINGLE)
** (simple-scan:8280): DEBUG: Processing request
** (simple-scan:8280): DEBUG: sane_open ("pixma:04A91714") -> 
SANE_STATUS_ACCESS_DENIED

** (simple-scan:8280): WARNING **: Unable to get open device: Access to
resource has been denied

-- 
Simple scan can't see my printer (scanner), it just see my web cam.
https://bugs.launchpad.net/bugs/546789
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