[ Thanks to jhansonxi for this link.
]
“There is a problem with scanner device permissions on
Ubuntu. Regular users (UID>999) can access libsane applications
like Xsane and Simple Scan without problems. Linux Scanner Server,
which is running in Apache as www-data, can’t access them without a
chmod o+rw on each scanner device. Nobody seems to know how the
permissions work so this has to be fixed manually in a terminal.
This is not n00b friendly so I created a GUI application that
automatically changes the permissions of every scanner device.“The application relies on scanimage and sane-find-scanner
utilities to identify scanner device ports then simply does a chmod
against all of them. It supports USB, SCSI, and optionally parallel
port (-p parameter) scanners and has been tested against the same
ones I used for my LSS patch. It uses the same universal dialog
code as webcam-server-dialog so it should work with almost any
desktop environment.”