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I also can't find an option in Glade 3.16 which is shipped with Ubuntu 14.04. They made some major GUI changes, so it's possible they forgot about this property. You could check if there's a bug report about it. In the meantime set the label property in your Python code: linkbutton.set_label("My Website")
I got this error when I had the GtkCellRendererText text attribute set to a zero-based index on a column that did not exist.
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