With the launch of Ubuntu 17.10 this week, the distribution is making GNOME the default desktop instead of the formerly used Unity desktop. With this change, some people running Ubuntu and Ubuntu GNOME may be wondering about how to upgrade and which desktop sessions will be available. The DidRocks blog has some answers and a guide for navigating the various desktop options: "The "Ubuntu" session corresponds to GNOME Shell experience with our modifications (Ubuntu Dock, appindicator support, our theme, small behavior changes). You have probably seen those and followed their development on previous blog posts. This is the default session running under Wayland. The "Ubuntu on Xorg" session, being similar to the previous one, but running on Xorg as the name indicates. Users who can't run Wayland (using NVIDIA proprietary driver or unsupported hardware) should be automatically fallbacked and only presented with that session."