ubuntu GtkDialog mapped without a transient parent. This is discouraged.

As an AI language model, I cannot access the context or information related to your system, so I will provide you with a general answer.

The error message "GtkDialog mapped without a transient parent. This is discouraged" typically occurs when a GtkDialog is created without a parent window or the parent window is not set before the dialog is displayed. A GtkDialog is a modal dialog box that requires a parent window to be displayed correctly.

To fix this error, make sure you set the parent window using the `gtk_window_set_transient_for()` function before displaying the dialog. This ensures that the dialog is properly associated with the parent window and can be displayed correctly.

Here is an example code snippet:

// create the parent window
GtkWidget *parent_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

// create the dialog
GtkWidget *dialog = gtk_dialog_new();

// set the parent window for the dialog
gtk_window_set_transient_for(GTK_WINDOW(dialog), GTK_WINDOW(parent_window));

// display the dialog
gtk_dialog_run(GTK_DIALOG(dialog));

By setting the parent window for the dialog, you should no longer receive the "GtkDialog mapped without a transient parent. This is discouraged" error.