Fixed unsensitive buttons

source/ubinstall-gtk.c

@@ -469,6 +469,8 @@ void on_page_changed(GtkWidget *,GtkWidget *,int page, main_window *widgets){
             gtk_widget_hide(widgets->PackageInstallationProgress);
             gtk_widget_hide(widgets->InstallationLabel);
             gtk_widget_hide(widgets->PackageInstallationLabel);
+            gtk_widget_set_sensitive(widgets->NextButton,1);
+            gtk_widget_set_sensitive(widgets->CancelInstallButton,1);
             main_config.install_complete=0;
             main_config.save_done=0;
             gtk_button_set_label(GTK_BUTTON(widgets->NextButton),RESTART_LABEL);