I can’t install letsencrypt
root@web:/letsencrypt# ./letsencrypt-auto
Updating letsencrypt and virtual environment dependencies...Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', gaierror(-2, 'Name or service not known'))': /simple/setuptools/
Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', gaierror(-2, 'Name or service not known'))': /simple/setuptools/
Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', gaierror(-2, 'Name or service not known'))': /simple/setuptools/
Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', gaierror(-2, 'Name or service not known'))': /simple/setuptools/
Could not find a version that satisfies the requirement letsencrypt (from versions: )
No matching distribution found for letsencrypt