Fedora 20, code-named “Heisenbug” was released on 17, December 2013 developed by global community members and sponsored by Red Hat Inc. Fedora 20 “Heisenbug” release is dedicates to Seth Vidal, who passed away this year in road accident. He was a lead developer of Yum and the Fedora update repository system. We, as a team (Tecmint.com) share deepest condolences and grief on this moment, may the God bless him the peace in heaven. This version is updated with latest version of packages and focused on cloud and virtualisation and ARM is now a primary an officially supported architecture.