3 ms·

How would you know when?

• prg318 13y ago
  Some packages will be held back by apt-get until you "dist-upgrade" them and apt-get will notify you of the held back packages when you apt get "upgrade".
• ars 13y ago
  If you get a lot of packages that it tries to uninstall. That's basically what dist-upgrade does: tries to uninstall the least number of packages to allow the update through. It never happens with a point release though - they are careful about that.