Select your user session or click not listed? to manually enter your username.The downside to using this approach is that every affected user will have to follow the same instructions. This change is per user and is persistent, so every future logon will default to your selection. Thankfully, Fedora allows us to change our desktop at the user logon screen. We can either set our new desktop environment from the user session logon screen, or we can outright disable it from the Gnome Desktop Manager configuration, permanently disabling it across the entire system. From my experiences it has been more prevalent on OSX, however, non-Apple users have completed too There are a variety of reasons why Wayland introduces flickering when running Virtualbox. The solution is to simply disable Wayland, forcing XOrg to run as the default display server. Thankfully, we do not have to endure this tortuous flickering for long. The problem appears to be most noticeable in VirtualBox, especially on OSX.

Depending on your system configuration, you may experience a very noticeable and headache-inducing screen flicker as a result. The most recent versions of Fedora Desktop run a version of Gnome that has display server to Wayland, replacing GNOME XOrg.

Fedora 26 virtualbox guest additions