I have the same problem.
I try install karmic in VirtualBox and packages have "Installed (manual)" status
I think, it is apt bug, because I try remove qemu packages, but its dependencies qemu-kvm not removed and not have "Installed (auto removable) status in Synaptic
P.S. I use ru.archive.ubuntu.com mirror
P.P.S. I think this bug must have "high or critical" importance
I have the same problem.
I try install karmic in VirtualBox and packages have "Installed (manual)" status
I think, it is apt bug, because I try remove qemu packages, but its dependencies qemu-kvm not removed and not have "Installed (auto removable) status in Synaptic
P.S. I use ru.archive. ubuntu. com mirror
P.P.S. I think this bug must have "high or critical" importance