Virtualbox guest additions in Fedora 26

I was installing Fedora 26 Workstation in VirtualBox 5.1.22r115126 with extension pack. I could not install the guest additions as I was missing some packages. First, make sure you have the latest available kernel installed:

# dnf update kernel*

If you get a new kernel installed, reboot the system to use the new kernel.

Install all packages needed for building the kernel modules for VirtualBox guest additions:

# dnf install gcc kernel-devel kernel-headers dkms make bzip2 perl

You will find the installer in: /run/media/USERNAME/VBOXADDITIONS_5.1.22_115126/

USERNAME is your username, and the version might be different.

Start the installer with ./VBoxLinuxAdditions.run and let the installer run.