Having just responded in the thread about "12.04 and NFS" made me wonder why there are now two package managers in Ubuntu, the "Package Manager" and the "Software Center".
I rarely use any GUI client to install software preferring to use apt-get from the command line. When I do want a GUI, I prefer to install synaptic even on my KDE platform. So I never had occasion to examine the differences between the Software Center and Package Manager applications until today.
Why isn't there just one single Package Manager application any more that includes all packages available to Ubuntu from all official sources? (PPAs are obviously an entirely different matter.) This seems unnecessarily confusing to me and would, I suspect, be even more confusing to a novice user.