Problem went away on its own.
** Changed in: synaptic (Ubuntu)
Status: New => Invalid
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Editing repositories in Synaptic/"Software Sources" has no effect
https://bugs.launchpad.net/bugs/302511
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Gah. Apparently this bug refused to go away until I reported, at which
time it immediately disappeared. I guess switching mirrors fixed it
somehow.
I can only assume that my sources.list became "corrupted" somehow, so
that it appeared valid to apt, but not valid to the automatic parser
that Synapt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/19968406/Dependencies.txt
** Attachment added: "ProcMaps.txt"
http://launchpadlibrarian.net/19968407/ProcMaps.txt
** Attachment added: "ProcStatus.txt"
http://launchpadlibrarian.net/19968408/ProcStatus.txt
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Editin
