Qapt and gksudo does not work

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http://www.kubuntuforums.net – Hello, I tried installing packages (e.g. Google Chrome, Steam), Qapt appeared, asked for password, downloaded the dependencies, and said 'DONE', but no, it wasn't installed. Also, if I search for certain packages using Muon Software Center (e.g. Skype, Steam, Kubuntu-restricted-extras) it does not show up anyting. If I try using USC it work, but it is buggy (for me) on Kubuntu. The other thing, is that gksudo does not work either. It appears, asks for password, hangs on a little bit, then disappears, and does nothing. What should I do? I know I should have reported it on Launchpad as a bug, (HowTos)