[ubuntu] Lucid: can't open Sofware Sources, Synaptic from GNOME, Update Manager hangs

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http://ubuntuforums.org – Hey peeps. Like the subject says, I can't open Sofware Sources, Synaptic from GNOME and Update Manager hangs when I try to DO anything. I've done a fair bit of searching, but nothing seems to work. I'm not sure when this started happening, but it might've been after I customized a theme (?) or chose a different default theme. Here are my symptoms. -- Choosing Software Sources and Synaptic Package manager causes taskbar to display "Starting Adminstrative Application..." and then taskbar item disappears and nothing happens. -- sudo synaptic (and sksu synaptic) has a we (Hardware)