http://ubuntuforums.org – Have installed HPLIP toolbox and started the guide. The program find the printer (HP color Laserjet 1600) and I can choice: o Download and install the plug-in from HP(recommended) o Select and install an existing local copy of the plug-in file When I select the first i get this error message: "ERROR: Plug-in file does not match its digital signature. File may have been corrupted o (Hardware)