[ubuntu] How install HP-printer driver?

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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 or altered. Error code: 2" Where may I find a plug-in for 10.04LTS? It worked automagically on 12.04. (Hardware)