german text detecion does work very bad

What OCR engine did you used for this? Did you add -l option to the settings (in case of German it should be "-l deu" for Tesseract and "-l grm" for CuneiForm)? I think this was your problem.

I've just made extensive changes to the OCR help page, read more about language handling there:

https://help.ubuntu.com/community/OCR#OCRFeeder

Hi, i was using the default one shipped in Ubuntu, taking a look at the settings it is:

Tesseract
/usr/bin/tesseract
$IMAGE $FILE; cat $FILE.txt

there is nothing to set a lnaguage :-)
should i add it with "arguments"?

+ What about adding a GUI Element to choose a language within OCRFeeder ?

@benste: try changing options like that:

-l deu $IMAGE $FILE; cat $FILE.txt

I also look for a GUI language chooser.

indipendent on where you add this the result is a empty text after running OCR

So that's a different story - no output means that you probably need to install additional language data. For German it's in a tesseract-ocr-deu package (or tesseract-ocr-deu-f in case of Fraktur script).

I don't know if 2.x series is good enough for German, but you may also consider this PPA, which contains fresh 3.x packages and few other fresh OCR tools, inluding other good engine, CuneiForm:

https://launchpad.net/~alex-p/+archive/notesalexp/

Developer I talk with about new official packages said it's a problem with Debian "free" constrains on language data and he needs few days to work it out, but those PPA files work good for Polish.

installed the packages - but still nothing detected
+ shouldn't the tesseract-ocr-deu package be auto installed by the language manager ?

Status changed to 'Confirmed' because the bug affects multiple users.