I have Ubuntu 14.04 with Gnome-Shell running and use Mathematica 10.2. Whenever I open a mathematica file and select some lines in it, I get a message from the system that mathematica is not responding. You may choose to wait a short while for it to continue or force the application to quit entirely.
This problem is also described at launchpad. However, it is stated there, that they cannot do anything about it. Now there is a statement at the redhat bugzilla page that one only has to change one line in the delete.c file from mutter, to deactivate the whole message. This hack would be a sufficient solution for me.
The question now is, how do I implement the proposed change in the file? I cannot find a delete.c file on my computer. Do I have to compile mutter myself?
diff --git a/src/core/delete.c b/src/core/delete.c
index 141cd49..d8a126e 100644
--- a/src/core/delete.c
+++ b/src/core/delete.c
@@ -98,6 +98,8 @@ show_delete_dialog (MetaWindow *window,
"Got delete ping timeout for %s\n",
window->desc);
+ return;
+
if (window->dialog_pid >= 0)
{
present_existing_delete_dialog (window, timestamp);