Comment 2 for bug 1713313

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dino99 (9d9) wrote : Re: Unable to launch backintime and gparted as root on Wayland session

This a well known wayland limitation.
The workaround (till the pkexec -> policykit transition is made) is to use xhost script.
Gparted already has an opened bug: https://bugs.launchpad.net/ubuntu/+source/gparted/+bug/1652282
and policykit has to be used, but is not directly concerned as a bug.