I logged into a system that had just installed the pbench-agent v0.71.0 release, a Fedora 36 box with Python 3.10 as the system default, and the following message was emitted before my first command prompt:

ls: cannot access '/opt/pbench-agent/lib*/python3.*/site-packages': No such file or directory

This appears to be due to the fact that for Python 3.10 the python modules are installed under /opt/pbench-agent/local/lib*/python3.*/site-packages/ (note the addition of local before lib in the path).