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I have Ubuntu 20.04 LTS and I want to download ROS Melodic I have followed this instruction from here.

After sudo apt install ros-melodic-desktop-full command terminal is showing:

Unable to locate package ros-melodic-desktop-full
Kulfy
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Azam Khan
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2 Answers2

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  1. Make sure to configure your Ubuntu repositories to allow restricted, universe, and multiverse. See this for a guide on how to do that.

  2. Issue the following command into terminal to setup your computer to accept software from packages.ros.org

    sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'

  3. Setup your keys by issuing the following into terminal:

    curl -sSL 'http://keyserver.ubuntu.com/pks/lookupop=get&search=0xC1CF6E31E6BADE8868B172B4F42ED6FBAB17C654' | sudo apt-key add -

  4. Update your packages

    sudo apt update

  5. Now install:

    sudo apt install ros-melodic-desktop-full
muru
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ldias
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    These are just the install instructions. And they do not work as the package cannot be found (like the OP). Wondering if they have depreciated Melodic because I have no trouble installing Noetic. – Mike Wise Feb 22 '22 at 09:12
  • @MikeWise Are ROS Noetic and ROS Melodic different packages? I don't think they have deprecated Melodic.. do you have any evidence to suggest they have? – ldias Feb 22 '22 at 19:50
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    Turns out only Noetic is supported under Ubuntu 20.04 (and thus WSL2), and only Melodice under Ubuntu 18.04, and that was causing the "Unable to locate package" error. Although you can hack the repository config files to override that limitation. Seems obvious now, but some how I read the install instructions multiple times and didn't notice that. – Mike Wise Feb 22 '22 at 20:52
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I was trying to install ros2 jazzy on ubuntu 24.04 noble numbat and faced same problem. During update I got an error saying the package link is not signed. Hence the update did not happen properly. I needed to edit the sources.list.d to modify the link with trusted=yes. With this the update downloads the required packages. for me this solved the problem.

Chetana Gadgil
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