Are you looking for Google Desktop in Linux? Google never release that program for Linux. Instead, we have an alternative from DocFetcher. It is a great replacement for Google Desktop with more features such as selecting what type of file to index. We can select what folder to index, what filetype, and view strings found in every file. DocFetcher can show search result in a table so you can search for a string in all PDF you have. Here we show how to install in Ubuntu and how to use it. DocFetcher official site is https://docfetcher.sourceforge.net. Thanks to qforce for providing DocFetcher.