Calibre is a free ebook management that works on Linux, OS X and Windows.It is meant to be a complete e-library solution and thus includes library management, format conversion, news feeds to ebook conversion, as well as e-book reader sync features and an integrated e-book viewer.
It’s very easy to install calibre on both 32-bit and 64-bit x86 machines.Just make sure you have xdg-utils installed on your system(search “xdg-utils” in System/Administration/Synaptic Package Manager),then run this command in terminal(Applications->Accessories->Terminal):

sudo python -c "import urllib2; exec urllib2.urlopen('').read(); main()"

It will take a few minutes to download package and properly install this on your system.
Once the installation finish,you can open calibre from Applications->Office->Calibre