When my computer updates Fedora, among others, it tries to update VirtualBox. But for some reason, it can't access the repository in VirtualBox.org and so it cannot update my OS. How do I make VirtualBox updates be only manual?
How to make Linux Fedora stop updating VirtualBox with OS updates
fedora;upgrade
Apparently at some point my OS got messed up. I just installed Fedora 23 and there is not a problem. There were a lot of other problems with my computer at that time but after I reinstalled Fedora, now it is working.