Only released in EOL distros:
A general system for graph optimization.
- Author: Rainer Kummerle, Giorgio Grisetti, Cyril Stachniss, Hauke Strasdat, Kurt Konolige
- License: LGPL
- External website: http://openslam.org/g2o.html
- Source: svn https://code.ros.org/svn/ros-pkg/stacks/vslam/trunk
This package integrates g2o into the ROS build system. For documentation, see the g2o entry in OpenSLAM.org.
This is almost surely not what you're looking for. For ROS Fuerte on Ubuntu, you can now install the ros-fuerte-libg2o Debian package instead.