POSTIN

/bin/sh

update-alternatives --install /usr/bin/pinentry pinentry /usr/bin/pinentry-gtk-2 20 --slave /usr/bin/pinentry-gtk pinentry-gtk /usr/bin/pinentry-gtk-2

POSTUN

/bin/sh

if [ "$1" = "0" ]; then
   update-alternatives --remove pinentry /usr/bin/pinentry-gtk-2
fi