So, recently I noticed a settings like icon next to the sign in button on the login screen. Upon clicking it I am presented with two options:
- Ubuntu
- Ubuntu on wayland
Why has this suddenly appeared?
Should I be worried?
What is Ubuntu on wayland?
I am running a persistent live Ubuntu 18.04 (the latest version as of 24 April 2019). I also noticed that it does not appear on my other persistent live version of Ubuntu 18.04 (the latest version as of 24 April 2019)
Best Answer
at the graphical login screen, you may see an icon either next to the login name, or at the top of the screen on the right; the icon may look like a settings industrial toothed wheel icon, or it may look like the ubuntu 3-branch symbol;
if you click on this icon, you may see:
or you may see this:
Xorg and Wayland are display servers (not to be confused with display managers, such as lightdm or gdm3, or with desktop environments, such as KDE, Unity, LXDE, XFCE, Openbox, Fluxbox, etc)
what this means, seeing these 2 options, is that you have one desktop environment, namely Ubuntu, and 2 display servers installed, and you can choose whichever you want; so which one should you choose?
Xorg has been around a long time, so it is likely that all linux programs work with it; so if you don't want to have things not working anymore, choose Xorg;
Wayland is new, and some programs do not work with it, such as gparted, or screen recorders, etc; one question here even noted that Wayland turns off your nvidia, causing the laptop to heat up;
to see which display server you are using, in a terminal/at a command prompt try this:
so, if you are trying Wayland and things don't work, log out, click on the icon on the login screen and choose Xorg then log back in.
Also if you have more than one display manager installed, for example you have gdm3 and lightdm, to check which one you are using, type at a terminal command prompt:
and to switch between them type
or
A text window appears where you can use the arrow keys to select one of the installed display managers and press enter.
It is possible to install other desktop environments as well, such as one or more of these or others, and then they will also appear in the list of desktop environments which you can choose from, before logging in:
Then the desktop environments list to choose from before login might look like this: