The thing is that I installeds first on Ubuntu 11.10 ROS electric using their instructions, then I needed to install ROS diamondback.

I tried to use their instructions to install it from the repositories and I found this problem:

sudo apt-get install ros-diamondback-desktop-full
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
ros-diamondback-desktop-full : Depends: ros-diamondback-ros-tutorials (= 0.2.4-s1312445230~lucid) but it is not going to be installed
Depends: ros-diamondback-geometry-tutorials (= 0.1.3-s1312445373~lucid) but it is not going to be installed
Depends: ros-diamondback-slam-gmapping (= 1.2.3-s1312435634~lucid) but it is not going to be installed
Depends: ros-diamondback-ros (= 1.4.9-s1312417708~lucid) but it is not going to be installed
Depends: ros-diamondback-visualization (= 1.4.1-s1312432000~lucid) but it is not going to be installed
Depends: ros-diamondback-vision-opencv (= 1.4.3-s1312425872~lucid) but it is not going to be installed
Depends: ros-diamondback-perception-pcl (= 0.10.0-s1312427042~lucid) but it is not going to be installed
Depends: ros-diamondback-rx (= 1.4.2-s1312430459~lucid) but it is not going to be installed
Depends: ros-diamondback-image-pipeline (= 1.4.2-s1312437407~lucid) but it is not going to be installed
Depends: ros-diamondback-simulator-gazebo (= 1.2.8-s1312440157~lucid) but it is not going to be installed
Depends: ros-diamondback-diagnostics-monitors (= 1.4.0-s1312439740~lucid) but it is not going to be installed
Depends: ros-diamondback-simulator-stage (= 1.2.5-s1312437801~lucid) but it is not going to be installed
Depends: ros-diamondback-image-common (= 1.4.1-s1312425748~lucid) but it is not going to be installed
Depends: ros-diamondback-common-tutorials (= 0.1.2-s1312463072~lucid) but it is not going to be installed
Depends: ros-diamondback-ros-comm (= 1.4.7-s1312424712~lucid) but it is not going to be installed
Depends: ros-diamondback-visualization-common (= 1.4.2-s1312430681~lucid) but it is not going to be installed
Depends: ros-diamondback-physics-ode (= 1.4.1-s1312430103~lucid) but it is not going to be installed
Depends: ros-diamondback-driver-common (= 1.2.3-s1312425659~lucid) but it is not going to be installed
Depends: ros-diamondback-executive-smach (= 1.0.2-s1312435548~lucid) but it is not going to be installed
Depends: ros-diamondback-common-msgs (= 1.4.0-s1312425065~lucid) but it is not going to be installed
Depends: ros-diamondback-image-transport-plugins (= 1.4.1-s1312426755~lucid) but it is not going to be installed
Depends: ros-diamondback-robot-model (= 1.4.0-s1312427974~lucid) but it is not going to be installed
Depends: ros-diamondback-visualization-tutorials (= 0.2.2-s1312464635~lucid) but it is not going to be installed
Depends: ros-diamondback-geometry (= 1.4.2-s1312425346~lucid) but it is not going to be installed
Depends: ros-diamondback-documentation (= 1.4.1-s1312464754~lucid) but it is not going to be installed
Depends: ros-diamondback-executive-smach-visualization (= 1.0.1-s1312459854~lucid) but it is not going to be installed
Depends: ros-diamondback-laser-pipeline (= 1.2.0-s1312429600~lucid) but it is not going to be installed
Depends: ros-diamondback-common (= 1.4.3-s1312425161~lucid) but it is not going to be installed
Depends: ros-diamondback-diagnostics (= 1.4.0-s1312425553~lucid) but it is not going to be installed
Depends: ros-diamondback-navigation (= 1.4.1-s1312429823~lucid) but it is not going to be installed”

I started trying to correct it and I followed the next (failed) steps:
So I tried to install it from source with this instructions. In a step (in the package geometry) I got asked for an user and password, I just hit Enter and everything went fine.

Changed the path where to install as by default is ~/ros but I found it nicer to be in /opt.

This lasted… one hour. And I got an error in the end, so I wasn’t happy.

So I found this link: http://answers.ros.org/question/2505/installing-ros-diamondback-on-ubuntu-1110-oneiric
Where a good soul explains how to install it. I find it ugly, but works!

Oh, and finally I need to be sure that I am using the correct version of ROS putting in my .bashrc the line:

source /opt/ros/diamondback/setup.bash

(or the one that is correct in that moment, electric, or diamondback).

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