# Stuck installing ros-melodic-pcl-conversions

Source: https://forum.modalai.com/topic/4097/stuck-installing-ros-melodic-pcl-conversions
Category: VOXL SDK and Software (https://forum.modalai.com/category/47/voxl-sdk-and-software)
Tags: ros
Posted: 2025-01-16 19:10:01 UTC by VSK
Replies: 4 · Views: 3322

## VSK · 2025-01-16 19:10:01 UTC

Hello 

I have installed ROS in VOXL 2 board using the instructions in the link https://docs.modalai.com/ros-installation-voxl2/.
When I tried installing  ros-melodic-PCL-conversions it took more than 30 minutes trying to  install python-twisted-core

Are there any alternatives or steps I am missing ...

## Reply by Zachary Lowell 0 · 2025-01-16 22:47:34 UTC

@vicky-s-karthik mind posting the exact commands that you ran?

ROS melodic is fully deprecated - so my recommendation is to move over to ros2 foxy which is what we support on the voxl2 as of right now. I will try and recreate your issue in the meantime. Please try installing ros melodic base as the cv2 instance on there conflicts with opencv on voxl-sdk.

## Reply by VSK · 2025-01-17 04:00:09 UTC (in reply to Zachary Lowell 0)

@Zachary-Lowell-0 
The voxl2 board has the Ubuntu 18.04.5 LTS OS on it. 
So I installed ROS Medolic as mentioned in https://docs.modalai.com/ros-installation-voxl2/ 

Then I tried installing the ros packages using the following command
sudo apt-get install -y ros-melodic-pcl-ros ros-melodic-pcl-conversions
but the installation is getting stuck at Setting up python-twisted-core (17.9.0-2ubuntu0.3) 

I ran  tail -f /var/log/dpkg.log to check the status which showed 
configure python-twisted-core:all 17.9.0-2ubuntu0.3 <none>
status half-configured python-twisted-core:all 17.9.0-2ubuntu0.3

## Reply by VSK · 2025-01-17 19:19:58 UTC (in reply to Zachary Lowell 0)

@Zachary-Lowell-0 
Due to project requirements, I cannot change the OS version
Please find the installation commands used 
voxl2:/$ sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
voxl2:/$ sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
voxl2:/$ sudo apt update
voxl2:/$ apt install -y ros-melodic-ros-base ros-melodic-image-transport

## Reply by teddy.zaremba · 2025-01-27 16:39:14 UTC (in reply to VSK)

@VSK said in [Stuck installing ros\-melodic\-pcl\-conversions](/post/20511):
> configure python-twisted-core:all 17.9.0-2ubuntu0.3 <none>
> status half-configured python-twisted-core:all 17.9.0-2ubuntu0.3

Maybe that package got corrupted on the install. Can you try running sudo apt-get clean?

If that doesn't work, you could also try removing both of the packages and do the install again.

```
$ sudo apt remove  python-twisted-core:all
$ sudo apt remove ros-melodic-pcl-ros ros-melodic-pcl-conversions
```