Melodic fresh install unmet dependencies
Hello,
I am trying to install ROS Melodic on a quite fresh (1 week old) Ubuntu 18.04 installation, but have run into a problem with unmet dependencies when following the instructions at http://wiki.ros.org/melodic/Installat... .
The error appears after the command:
alex@alex-XPS-15-9530:~$ sudo apt-get install ros-melodic-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-melodic-desktop-full : Depends: ros-melodic-desktop but it is not going to be installed
Depends: ros-melodic-perception but it is not going to be installed
Depends: ros-melodic-simulators but it is not going to be installed
Depends: ros-melodic-urdf-sim-tutorial but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
I tried following the dependency tree but after getting 4 levels of dependency in (dependency's dependency and so on) I got the feeling that this is not the right way to install ROS, as it should work just with the steps outlined in the installation instructions.
As per the installation instructions I have:
- Allowed Ubuntu software to install from "restricted", "universe" and "multiverse
-
configured my sources.list:
alex@alex-XPS-15-9530:~$ cat /etc/apt/sources.list.d/ros-latest.listdeb http://packages.ros.org/ros/ubuntu bionic main -
Set up the keys
-
Updated my package index and also ran
apt upgradeanddist-upgrade
I have checked these two posts with a seemingly similar issue on the forum:
https://answers.ros.org/question/2992... - The OP didn't indicate whether it was resolved, but another person said that they solved the problem by removing previously installed ROS and Gazebo software. I haven't installed anything ROS related on this computer yet.
https://answers.ros.org/question/3067... - This was solved by using aptitude instead of apt. I tried this but aptitude's solution seemed to leave out a lot of ros-melodic packages and after running it I still had no ROS installed.
I also found this: https://askubuntu.com/questions/10419... - I don't know how the OP figured out that libusb was causing the problem. I don't have enough "reputation" to comment on that thread to ask how they did it! Does anyone know how to investigate that?
Now I'm a bit stuck! Does anyone have any ideas?
Any help is much appreciated.
Alex
EDIT
Output of
sudo apt-get install ros-melodic-urdf-sim-tutorial
:
alex@alex-XPS-15-9530:~$ sudo apt-get install ros-melodic-urdf-sim-tutorial
[sudo] password for alex:
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 ...
What's the output of
sudo apt-get install ros-melodic-urdf-sim-tutorial? Seeing that pkg mentioned last makes me think there is some dependency ofros-melodic-urdf-sim-tutorialthat is already at a newer version and cannot be downgraded, leading toaptgiving up.Thanks for your response. I have added the output of that command as an edit to the original question as it is over the character limit for a comment.
Can you please install
synapticand see which packages have a broken status?Also: what is the output of
sudo apt-get install ros-melodic-gazebo-ros? I'm still suspecting Gazebo.very good. That is also the only acceptable way to provide more information.
Comments are only for very limited interaction.
Have you ever installed anything "interesting" on this machine? Used any PPAs to install newer versions of packages that you wanted to use? That is typically why
aptfails to resolve dependencies.re: following deps 'down': ignoring
aptitude, that is the only way I know to approach this.Thanks again for your suggestions, I have edited the original question with the responses.
Thanks for the update.
Could you please follow the
*-gazebo-devpackage?I gave that a go in edit 3 - assuming that is what you meant by follow the package?