I just installed Kubuntu 13.04, and I have never had this happen, in 5 years (started with Hardy) of Linux:
When I try starting Synaptic from the menu, or from the terminal with "gksu synaptic," the familiar "enter your password" window comes up. When I enter my password, it tells me that the password is incorrect. The password works in the terminal with apt-get, works in the Ubuntu Software Center, and works with Muon.
Why doesn't it work with Synaptic? I've been using Synaptic for years without this weird problem.
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