Sorry, it seems that that the buggy update was gdm 2.28.1-0ubuntu1, since synaptic's history tells that I have reinstalled (to see if it helps to solve this bug) gdm 2.28.1-0ubuntu1 on 7.11.2009.
Sorry, it seems that that the buggy update was gdm 2.28.1-0ubuntu1, since synaptic's history tells that I have reinstalled (to see if it helps to solve this bug) gdm 2.28.1-0ubuntu1 on 7.11.2009.