As explained in bug 425156, gksu is dead and should be replaced by direct polkit usage when needed (as was done with gparted). But, with this exact package, I don't fully understand why the need of gksu, I have also checked other distributions and looks like none of them are using any system to gain root privileges Thanks
I don't understand the "depends on"...
should be fixed now
Fixed in 1.1_p2-r1