Topic: [SOLVED] How to run GParted on a GNOME Wayland desktop
Fedora 21 and later releases include the option to also use the new Wayland as well as the existing X11 Window System to display graphics on the screen. While Wayland provides compatibility for existing X11applications, configuration of this is not yet 100% compatible with using X11 Window System natively. Specifically GParted needs to run as root, rather than your own user logged in to the desktop, and as found in Fedora 23 this is not yet allowed.
Upstream Fedora bug report:
Bug 1266771 - Under Wayland apps run via su or sudo are not authorised to connect to the X11 display server
At the login screen select "GNOME on Wayland" rather than "GNOME or "GNOME Classic" to use Wayland.
When GParted is run from the desktop it just never starts. Run GParted from a terminal to see the failure:
[fedora@localhost ~]$ sudo gpartedbin [sudo] password for fedora: No protocol specified (gpartedbin:19193): Gtk-WARNING **: cannot open display: :0 [fedora@localhost ~]$
Use one of the following workarounds:
1) Do not use Wayland. Instead select either "GNOME" or "GNOME Classic" at the login screen.
2) Allow all local users to display applications on your desktop. Before running GParted type the following into a terminal window: