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hi guys：
      I met some problems in installing devstack . the details please refers to "Errors" listed as below.           The environment: 1) Win 10 ; 2) VMware workstation ;3) ubuntu-18.04.5-desktop-amd64;4)devstack
         The installation processes refer to the devstack quick start   (https://docs.openstack.org/devstack/latest/)                    Could you give me the solution to solve the problem.    

Error :
Installing collected packages: oslo.rootwrap, retrying, os-win, oslo.privsep, os-brick, simplejson, python-cinderclient, glance-store   Attempting uninstall: simplejson     Found existing installation: simplejson 3.13.2 ERROR: Cannot uninstall 'simplejson'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall. +inc/python:pip_install:1                  exit_trap +./stack.sh:exit_trap:489                  local r=1 ++./stack.sh:exit_trap:490                  jobs -p +./stack.sh:exit_trap:490                  jobs= +./stack.sh:exit_trap:493                  [[ -n '' ]] +./stack.sh:exit_trap:499                  '[' -f '' ']' +./stack.sh:exit_trap:504                  kill_spinner +./stack.sh:kill_spinner:399               '[' '!' -z '' ']' +./stack.sh:exit_trap:506                  [[ 1 -ne 0 ]] +./stack.sh:exit_trap:507                  echo 'Error on exit' Error on exit +./stack.sh:exit_trap:509                  type -p generate-subunit +./stack.sh:exit_trap:510                  generate-subunit 1589476087 780 fail +./stack.sh:exit_trap:512                  [[ -z /opt/stack/logs ]] +./stack.sh:exit_trap ...
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