I have a bunch of non-official repos in my APT sources which sometimes cause depedency issues (newer versions of libraries than certain official packages expect). Because they've caused some issues in the past, I've had to remove the metapackage ubuntu-desktop.
So after an upgrade yesterday, the update manager, Synaptic, add/remove and all those other graphical APT programs, stopped working because of some of these dependency problems. Ubuntu-desktop couldn't be installed using apt-get (neither could it using Synaptic back when it worked), so I tried Aptitude to see if it could solve my problems...
By selecting ubuntu-desktop for install, Aptitude properly downgrades the packages causing problems, but only those, so my system is fully functional. Truly great dependency solving and even provides a curses GUI comparable to Synaptic; I'm an Aptitude convert now.
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