Hello, It seems the newer atk1.0 is incompatible with the older at-spi2-core, and since it wasn't announced by upstream, that wasn't expressed in Debian as a dependency. The easiest way to fix it is to upgrade libatspi2.0-0 to the unstable version: apt-get -t unstable libatspi2.0-0=2.12.0-2 That version should get propagated to testing soon. Samuel