The debug info will be output to the original command prompt (terminal window).

Calibre will launch, and you can can add the problem ebook the usual way. Open a command prompt (terminal window) and type 'calibre-debug -g' (without the quotes). This will print out a lot of helpful info that can be copied into any online help requests. If you find that it’s not working for you, you can save a lot of time by trying to add the ebook to Calibre in debug mode. If you click the Cancel button, all your changes in all the configuration dialogs will be lost. When you have finished entering your configuration information, you must click the OK button to save it. If you have used previous versions of the various DeDRM plugins on this machine, you may find that some of the configuration dialogs already contain the information you entered through those previous plugins. Additional help on the information required is available in each of the the dialogs. The buttons in this dialog will open individual configuration dialogs that will allow you to enter the needed information, depending on the type and source of your DRMed eBooks. If you have other DRMed ebooks, you will need to enter extra configuration information. On Linux, keys for Kindle for PC and Adobe Digital Editions need to be generated separately (see the Linux section below) If all your DRMed ebooks can be opened and read in Kindle for Mac/PC and/or Adobe Digital Editions on the same computer on which you are running calibre, you do not need to do any configuration of this plugin. On Windows and Mac, the keys for ebooks downloaded for Kindle for Mac/PC and Adobe Digital Editions are automatically generated. However, you should also delete any older DeDRM plugins, as this DeDRM plugin replaces the five older plugins: Kindle and Mobipocket DeDRM (K4MobiDeDRM), Ignoble Epub DeDRM (ignobleepub), Inept Epub DeDRM (ineptepub), Inept PDF DeDRM (ineptepub) and eReader PDB 2 PML (eReaderPDB2PML).

You have obviously managed to install the plugin, as otherwise you wouldn’t be reading this help file. If you already have DRMed ebooks in your calibre library, you will need to remove them and import them again. This plugin removes DRM from ebooks when they are imported into calibre. DeDRM Plugin Configuration DeDRM Plugin (v6.0.9)

Calibre with the dedrm plugin