I guess you're having a hard time finding documentation about this as installing a package hasn't changed between ROS 1 and ROS 2. If a package is released, and you're using ROS on any supported Debian or Ubuntu flavour, installing it would be a matter of:
sudo apt install ros-$ROS_DISTRO-package-name
so in this case:
sudo apt install ros-dashing-tf2-ros
Note that this is how you would install any Debian/Ubuntu package, not just released ROS packages. Which is probably another reason why it's not overly documented.
I'm not saying it's a stupid or unnecessary question btw, just proferring possible rationales for why you cannot find any documentation about this subject.
Edit:
I am having trouble importing the tf2_ros module to python when I am writing my own nodes - keep getting "no module named tf2_ros". [..] So what I am asking is how do I make the package available so that I can import the python modules when writing my own python nodes?
If that is your actual question then it appears it's actually a duplicate of #q309889.
Summary: the Python side to tf2_ros was only released into Eloquent, not Dashing.
Edit 2: it seems you asked a similar question in #q350839. @tfoote remarks there the package tf2_ros was released into all ROS 2 versions, which is technically correct. I do believe that the Python side of tf2_ros was only included in the Eloquent version though (because of this comment by Chris):
This was merged into master, and will be part of the Eloquent release: https://index.ros.org//doc/ros2/Releases/Release-Eloquent-Elusor/
The changes were too invasive to backport into Dashing.
Originally posted by gvdhoorn with karma: 86574 on 2020-04-29
This answer was ACCEPTED on the original site
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Original comments
Comment by svintissen on 2020-04-29:
Thanks, I think I have to rephrase the question. I allready have the tf2 package installed and I can run the static_transform_publisher from terminal, but I am having trouble importing the tf2_ros module to python when I am writing my own nodes - keep getting "no module named tf2_ros".
So what I am asking is how do I make the package available so that I can import the python modules when writing my own python nodes?
