You aren’t providing much to go on here. Are you the admin? Did you set up the Jupyterhub? Is it the Littlest JupyterHub and you’ve looked here and in the documentation? Checked the other JupyterHub ‘permission’ topic posts and tried or provided what was typically asked there?
Also, in case you aren’t aware, as a typical user, you should be using the %pip install and %conda install magics. It is better than the outdated !pip install route for typical users. See Pythonic Perambulations - Installing Python Packages from a Jupyter Notebook: New Jupyter Magic Functions and additional resources in my recent post here.
Any chance %pip install or %conda install works without the issue?