Gdebi close when trying to install a .deb with right-clic

In focal(20.04), gdebi 0.9.5.7+nmu3 has a problem.

In a terminal : sudo gdebi xxx.deb works (but no graphic mode)

In a terminal : sudo gdebi-gtk launch gdebi. Then, in the graphic UI, choose a .deb file ("file > open"), then clic on "install" and it's works.

BUT right-clic on the .deb, then "open with gdebi" => gdebi launch, et show the .deb file. But clic on "install" button, and gdebi close without any installation.

Solution / workaround :

change in gdebi.desktop the line

 exec=gdebi-gtk %f

     by :

 exec=sh -c "gdebi-gtk %f"

And it's works perfectly.

Please, change the gdebi.desktop in gdebi.deb on focal.