Comment 25 for bug 1652282

So, basically, Wayland doesn't allow something really insecure where the whole GUI and everything has root privileges, so it doesn't allow insecure applications to gain root access, however a program can be easily adapted (depending on how it's written) in order to be secure and then you will be able to run it as normal under Wayland. For instance etherape recently got adapted and you just have to now run it like so "sudo etherape -Z username" and then it runs in a way Wayland finds secure and thus it runs as normal as a GUI program but it just runs the GUI as the normal specified user and only the necessary components as root.

Anyway, has GParted upstream released a fix for this? Programs just have to match the new security standards in order to run. That's all, they will have to change and then your experience will be fine again. But I don't think you're going to be able to lessen the Wayland standards, instead take this up with the other developers so that they make their programs meet those standards.