I'm assigning this to synaptic for now.
What does line 49 in /etc/apt/sources.list read? (you can view the file
e.g. with gedit or any other text editor).
Have you done something that would has changed your sources list, e.g.
manually added a source?
** Changed in: synaptic (Ubuntu)
Sourcepackagename: linux-source-2.6.20 = synaptic
Status: New = Incomplete
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synaptic manager opens with an error message and crashes
https://bugs.launchpad.net/bugs/134708
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