Package: kword Version: 1:1.9.96.0~that.is.really.1.9.95.3-1 Severity: serious This package in experimental contains /usr/share/icons/hicolor/16x16/apps/kword.png and other icon files that are also contained in kword-data 1:1.6.3-5 in unstable. This creates failures when trying to upgrade kword from unstable to experimental So either you should add Replaces: kword-data or perhaps add a kword-data package for the experimental package as well.