Unpacking konqueror failed because it was unpacked before kdebase-libs, and the old kdebase-libs (2.2.2-14) shares a file with the new konqueror package (2.2.2-14.2). I imagine this is a bug in the dependency information for the security updates rather than a bug in apt and/or dpkg. I fixed my system "by hand": dpkg --pending --configure apt-get install konqueror FYI, John