This isn't fixed : ... Preparing to unpack .../gnat-4.9-base_4.9-20140330-1_all.deb ... Unpacking gnat-4.9-base (4.9-20140330-1) ... dpkg: error processing archive /var/cache/apt/archives/gnat-4.9-base_4.9-20140330-1_all.deb (--unpack): trying to overwrite '/usr/share/ada/debian_packaging.mk', which is also in package gnat-4.6 4.6.4-3 Didn't you test this before uploading the package ? -Ralf.