Update jammy from 9.0.0+dfsg-3 to 9.0.0+dfsg-3.1

Manfred Hampl suggests this article as an answer to your question:
FAQ #3037: “no rolling release”.

I suggest that you try manually downloading and installing the tinyxml2 packages for Ubuntu lunar on your jammy system. If that works well, then this can serve as proof that a backport of the *-3.1 package to jammy may be feasible.

Thanks. Yes, it works. Here was my test process.

I removed libtinyxml2-dev on my Ubuntu 22 host.

    sudo dpkg -r --force-depends libtinyxml2-dev

Then I installed the following from lunar through dpkg onto my Ubuntu 22 host.
    https://answers.launchpad.net/ubuntu/lunar/amd64/libtinyxml2-9/9.0.0+dfsg-3.1
    https://answers.launchpad.net/ubuntu/lunar/amd64/libtinyxml2-dev/9.0.0+dfsg-3.1

Finally, without building tinyxml locally, I used their supplied test script, but locked it to config mode.

ryan@B650-970:~/Dev/ros2_ws/src/tinyxml2/test$ cmake -S . -B build
    CMake Debug Log at CMakeLists.txt:7 (find_package):
        /usr/lib/x86_64-linux-gnu/cmake/tinyxml2/tinyxml2Config.cmake
        /usr/lib/x86_64-linux-gnu/cmake/tinyxml2/tinyxml2-config.cmake

    CMake Debug Log at CMakeLists.txt:7 (find_package):

    -- Configuring done
   -- Generating done
   -- Build files have been written to: /home/ryan/Dev/ros2_ws/src/tinyxml2/test/build

 The slightly modified CMakeLists guarantees the config scripts are the ones found, and adds debug to make sure its the one we expect.

     set(CMAKE_FIND_DEBUG_MODE TRUE)
    find_package(tinyxml2 REQUIRED CONFIG)
    set(CMAKE_FIND_DEBUG_MODE FALSE)

This matches the newly installed cmake folder contents that the previous packaging patch fixed on other versions.

    $ dpkg --contents libtinyxml2-dev_9.0.0+dfsg-3.1_amd64.deb | grep cmake
    drwxr-xr-x root/root 0 2022-05-16 03:14 ./usr/lib/x86_64-linux-gnu/cmake/
    drwxr-xr-x root/root 0 2022-05-16 03:14 ./usr/lib/x86_64-linux-gnu/cmake/tinyxml2/
    -rw-r--r-- root/root 2878 2022-05-16 03:14 ./usr/lib/x86_64-linux-gnu/cmake/tinyxml2/tinyxml2-config-version.cmake
    -rw-r--r-- root/root 1988 2021-06-06 18:10 ./usr/lib/x86_64-linux-gnu/cmake/tinyxml2/tinyxml2-config.cmake
    -rw-r--r-- root/root 883 2022-05-16 03:14 ./usr/lib/x86_64-linux-gnu/cmake/tinyxml2/tinyxml2-shared-targets-none.cmake
    -rw-r--r-- root/root 3847 2022-05-16 03:14 ./usr/lib/x86_64-linux-gnu/cmake/tinyxml2/tinyxml2-shared-targets.cmake

Yes, I get that ubuntu is not a rolling release, however that patch is a bugfix for a packaging error; the actual library source code has not changed.

I propose a backport of *-3.1 is feasible.

Independent whether this is named bugfix or backport, The next step must be creating a bug report in the bug tracker.

Done! Take a look here:https://bugs.launchpad.net/ubuntu/+source/tinyxml2/+bug/2045574

I appreciate your guidance.