post_install() {
   update-desktop-database -q
   xdg-icon-resource forceupdate
   xdg-desktop-menu forceupdate
   gtk-update-icon-cache
}

post_upgrade() {
   update-desktop-database -q
   xdg-icon-resource forceupdate
   xdg-desktop-menu forceupdate
   gtk-update-icon-cache
}