Due to some reasons auto installation is not working for LinuxMint 12. We regret for the inconvenience .
Please install the hplip-3.12.4 from the source package hplip-3.12.4.tar.gz. You will find the detailed steps to download and install this at this link : http://hplipopensource.com/hplip-web/install/manual/distros/linuxmint.html
Due to some reasons auto installation is not working for LinuxMint 12. We regret for the inconvenience . 12.4.tar. gz. You will find the detailed steps to download and install this at this link : http:// hplipopensource .com/hplip- web/install/ manual/ distros/ linuxmint. html
Please install the hplip-3.12.4 from the source package hplip-3.