post_upgrade() {
    killall -r 'fix-(flatpaks-theming|theming|tweaked-desktop-files)'
    sudo -u "$SUDO_USER" setsid -f fix-tweaked-desktop-files
    sudo -u "$SUDO_USER" setsid -f fix-theming
    sudo -u "$SUDO_USER" setsid -f fix-flatpaks-theming
}