I followed many forum threads and was lucky to get it solved. Thanks all for the help. Just for other’s help. The hint above that the bench path is incorrect was the first step in identifying the problem. I then deleted all the wrong directories.
I then followed Bench update fails: /bin/sh: 1: ./env/bin/pip: not found - #9 by kdevloper
Then I found nginx was not working and fixed it’s issues. FInally a reboot did the job.