If you're using gnome only but want to use k3b as your burning-app you can install it also in gnome. To start k3bsetup kdesu is needed. You can link sudo to do this job with followed command in a terminal:

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sudo ln -sfv /usr/bin/sudo /usr/bin/kdesu

after that you can start k3bsetup.

If you install kde sometime your created kdesu will be overwritten ...