Missing joint trajectory controller

edit

I'm using ros melodic on Ubuntu 18.04 LTS and when I try to make my workspace with catkin_make

Have you made sure to install all dependencies before doing that?

Please refer to #q252478 for a possible workflow.

And to avoid an xy-problem: can you explain why you are building the joint_trajectory_controller from source on bionic?

Edit:

I followed this tutorial for UR robots: https://github.com/UniversalRobots/Un...

If with "this tutorial" you mean the steps listed in the Building section of the README, then those would seem to already include the rosdep install .. command described in #q252478.

Did you run those commands? Did they successfully complete? If not: what was the error output?

And I got the error when I tried to run catkin_make.

If dependencies have not been installed, you'll receive the error message you show.

About the xy_problem you're right. I tried to solve my first problem with that, following my friend's advice.

Always prefer to use binary packages over building things from source. Do not simply "build a package from source" if you run into the CMake error you show. That should be the absolute last resort.

I cannot repeat this often enough. Please also tell your friend.

There are few exceptions, some of which are described here: #q320046.

Finally: if there are problems with the installation and setup guide of Universal_Robots_ROS_Driver, you should report those on the issue tracker.

Edit 2:

Following the Building, I get this error message after

$ sudo apt update -qq

450 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://packages.ros.org/ros/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
W: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/bionic/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
W: Some index files failed to download. They have been ignored, or old ones used instead.

Btw, I get other errors for the rosdep install line

You are using a machine (or a container) that has either not setup the ROS package repositories correctly, or is running into #q325039.

Note how the readme of Universal_Robots_ROS_Driver states:

This driver requires a system setup with ROS

So you'll have to make sure that has been done before following the instructions in the readme.