Rails/Bundler – libxml2 is missing error Apr 21, 2011 This is mainly just a quick reference for myself because I keep getting this error and have to search the internet for the solution. Basic problem is that on Ubuntu gems that use the nokogiri library for XML parsing require libxml2 which isn’t usually installed. When you try to install certain gems such as nokogiri or mechanize, either through gems directly or through bundler, get a message about missing dependencies – and when you wade a little deeper that libxml2 is missing. Development Ruby on Rails bundler gem libxml2 mechanise nokogiri rails ruby xml