Hello,
After installing GnuRadio 3.10 on Ubuntu 22.04 using PyBombs, I got this error:

After following the steps indicated in this web page : https://wiki.gnuradio.org/index.php/ModuleNotFoundError , I found out that the packages are in /local/lib and not in /lib/ as follows: /home/lionsoft/GnuRadio**/local/lib/**python3.10/dist-packages/gnuradio
The solution for me was to modify the setup_env.sh file to add /local/ in the PYTHONPATH command line.