[octopus@pc3 ~]$ sudo yum install VirtualBox [sudo] password for octopus: Loaded plugins: langpacks Package VirtualBox-4.3.20-3.fc21.x86_64 already installed and latest version Nothing to do
$ sudo dnf install VirtualBox Last metadata expiration check: 0:02:42 ago on Fri Aug 26 08:19:11 2016. No package VirtualBox available. Error: Unable to find a match.