[alexxxm]

that command worked, and after that "calibre_postinstall" worked too without errors.

But calibre dies at launch with:

Traceback (most recent call last):
  File "/usr/bin/calibre", line 8, in <module>
    load_entry_point('calibre==0.4.89', 'gui_scripts', 'calibre')()
  File "build/bdist.linux-i686/egg/calibre/gui2/main.py", line 1252, in main
  File "build/bdist.linux-i686/egg/calibre/gui2/main.py", line 74, in __init__
  File "build/bdist.linux-i686/egg/calibre/gui2/main_ui.py", line 135, in setupUi
AttributeError: setHeaderHidden

alessandro