Comment 3 for bug 669430

i just had a closer look, it always fail on libqt4-dev-dbgsym, which looks strange in my cache (the Section part), confirmed in http://ddebs.ubuntu.com/dists/natty/main/binary-i386/Packages

# apt-cache show libqt4-dev-dbgsym
Package: libqt4-dev-dbgsym
Priority: extra
Section: libdevel
 libqt4-svg (= 4:4.7.1-0ubuntu4), libqt4-xml (= 4:4.7.1-0ubuntu4),
 libqt4-sql (= 4:4.7.1-0ubuntu4), libqt4-script (= 4:4.7.1-0ubuntu4),
 libqt4-scripttools (= 4:4.7.1-0ubuntu4), libqt4-xmlpatterns (= 4:4.7.1-0ubuntu4),
 libqt4-qt3support (= 4:4.7.1-0ubuntu4), libqt4-designer (= 4:4.7.1-0ubuntu4),
 libqt4-help (= 4:4.7.1-0ubuntu4), libqt4-test (= 4:4.7.1-0ubuntu4),
 libqt4-declarative (= 4:4.7.1-0ubuntu4), qt4-qmake (= 4:4.7.1-0ubuntu4), libx11-dev
Installed-Size: 63668
Maintainer: Kubuntu Developers <email address hidden>
Original-Maintainer: Debian Qt/KDE Maintainers <email address hidden>
Architecture: amd64
Source: qt4-x11
Version: 4:4.7.1-0ubuntu4
Depends: libqt4-dev (= 4:4.7.1-0ubuntu4)
Conflicts: libqt4-dbg, libqt4-webkit-dbg, libqt4-xmlpatterns-dbg, qt4-demos-dbg
Filename: pool/main/q/qt4-x11/libqt4-dev-dbgsym_4.7.1-0ubuntu4_amd64.ddeb
Size: 18516782
MD5sum: 8f73a69762ec51bcbbfbf8a0d239d5e9
SHA1: ba2c6ecd4b6cbbb511a44af2010675a961eeb106
SHA256: 16b123dbc292412768f47cbb7d8d23d392718bdbde24e5c80160919919c6aba7
Description: debug symbols for package libqt4-dev
 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 This package contains the header development files and development programs
 used for building Qt 4 applications.
Homepage: http://www.qtsoftware.com