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2020-05-07 09:46:05 -0600 asked a question problem with instalaltion of openstack

I try to isntall opestack with the istructions of that exist here: https://docs.openstack.org/devstack/latest/ (https://docs.openstack.org/devstack/l...) on Ubuntu 18.04. I have the following problem when execute ./stack.sh

Exception: Traceback (most recent call last): File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/basecommand.py", line 215, in main status = self.run(options, args) File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/commands/install.py", line 342, in run requirement_set.prepare_files(finder) File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/req/req_set.py", line 380, in prepare_files ignore_dependencies=self.ignore_dependencies)) File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/req/req_set.py", line 554, in _prepare_file require_hashes File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/req/req_install.py", line 281, in populate_link self.link = self._wheel_cache.cached_wheel(self.link, self.name) File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/wheel.py", line 68, in cached_wheel self._cache_dir, link, self._format_control, package_name) File "/opt/stack/requirements/.venv/lib/python3.6/site-packages/pip/wheel.py", line 129, in cached_wheel wheel_names = os.listdir(root) PermissionError: [Errno 13] Permission denied: '/opt/stack/.cache/pip/wheels/a7/c1/ea/cf5bd31012e735dc1dfea3131a2d5eae7978b251083d6247bd' Can anyone help?