Unable to install devstack on ubuntu16.04 version

asked 2018-04-16 03:59:44 -0500

I am installing devstack in ubuntu16.04 on oracle virtual box

The directory '/opt/stack/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag. The directory '/opt/stack/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag. Am getting the error during devstack installation and throws exit on error message .

Below error shows and stops installation .What i need to do overcome the issue .

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