This works exactly as expected. mozilla-acroread depends on mozilla- browser. One way to satisfy this is via galeon and you seem to have another mozilla-browser installed as well. But aptitude has no automatic way of knowing which one it could deinstall, thus it keeps both.
** Changed in: aptitude (Ubuntu) Assignee: (unassigned) => Rolf Leggewie Status: Unconfirmed => Rejected -- automatically installed package is not deinstalled https://launchpad.net/bugs/47274 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs