After update my System Operative I got this message when try bench start

Traceback (most recent call last):
  File "/home/[user]/.local/bin/bench", line 5, in <module>
    from bench.cli import cli
ModuleNotFoundError: No module named 'bench'


Was it bench update that resulted in the error or an update to the OS?

I have the same problem when upgrade ERPNext v13.37 from Ubuntu 18.04 to 20.04. When use “bench restart”, it showed the same

was OS