It appears that no yaml-cpp is installed
sudo apt-get remove yaml-cpp Package yaml-cpp is not installed, so not removed
But when I try to install yaml-cpp I can not because apt-get all of a sudden remembers an old version of yaml-cpp that now conflicts.
sudo apt-get install yaml-cpp The following NEW packages will be installed: yaml-cpp 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 205 kB of archives. After this operation, 577 kB of additional disk space will be used. Get:1 http://packages.ros.org/ros/ubuntu/ precise/main yaml-cpp i386 0.2.7-5precise-20120502-0513-+0000 [205 kB] Fetched 205 kB in 0s (237 kB/s) (Reading database ... 342813 files and directories currently installed.) Unpacking yaml-cpp (from .../yaml-cpp_0.2.7-5precise-20120502-0513-+0000_i386.deb) ... dpkg: error processing /var/cache/apt/archives/yaml-cpp_0.2.7-5precise-20120502-0513-+0000_i386.deb (--unpack): trying to overwrite '/usr/include/yaml-cpp/emitter.h', which is also in package yaml-cpp0.2.6-dev 0.2.6-4~oneiric dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/yaml-cpp_0.2.7-5precise-20120502-0513-+0000_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)