Thomas, thank you for the quick response.

On 12.04.2013 17:27, Thomas E. Horner wrote:
> of cause the output and outcome is the same if i enter the commands on the 
> "real" console.
No, this is NOT of course. You can be sure I would not have asked
otherwise.  Scanner permissions for sane devices have been a long-
standing issue and has basically always been broken (at least that's my
experience) just in different ways in different releases.  You can have
a look at bug 236956 to learn that it matters a lot these days whether
you are actually logged in to the machine and how you are logged in.

> sudo scanimage -L
> No scanners were identified. If you were expecting something different,
> check that the scanner is plugged in, turned on and detected by the
> sane-find-scanner tool (if appropriate). Please read the documentation
> which came with this software (README, FAQ, manpages).

Thank you for that information.  we can rule out a permissions problem,
then.  Maybe you can compare /lib/udev/rules.d/40-libsane.rules between
precise and quantal to see if you can spot any relevant difference.

** Changed in: sane-backends (Ubuntu)
     Assignee: Rolf Leggewie (r0lf) => (unassigned)

** Changed in: sane-backends (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1080787

Title:
  hp scanner 5300c does no longer work after upgrading to quantal

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