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 ...