Do you remember when that happened? I vaguely remember that I used to experience problems installing packages in Aptitude and it would make me "fix" them without a way forward that I liked, but that was years ago.
eh, I switched to arch around.... 2013/2014 ? after an especially bad crash with sid. Never used aptitude, only apt-get. Since then I'm carrying the same "distro" from computer to computer.
Aptitude is mostly a front-end to apt-get, but if you try to install some impossible combination of packages or get your packages in a weird state, aptitude offers solutions to fix it.
