- Fedora and Mint differ from Ubuntu in that they are both community-based projects, while Ubuntu is developed by a company (Canonical).
- Ubuntu and Mint differ from Fedora in that they are Debian-based: their package manager is APT and their packages follow the DEB (Debian) package format. Fedora is RedHat-based, it’s package manager is DNF (formerly YUM) and it’s packages follow the RPM (RedHat Package Manager) package format.
- They all differ in the default Desktop Environment: MATE or Cinnamon for Mint, Unity for Ubuntu, and Gnome for Fedora. But all of these environments (and others) can be installed on any of them.
- The oldest is Fedora (released 2003), followed by Ubuntu (released 2004), then Mint (released 2006).
- Their philosophies differ: Ubuntu’s philosophy is to provide a user-friendly OS. Mint’s philosophy is to provide a more “sighty” or “elegant” OS. Fedora’s philosophy is to provide a rolling (or continuously developing) release.

( Source: Quora response on https://www.quora.com/How-do-Linux-Mint-Ubuntu-and-Fedora-differ )
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