La instalación de pip3 [paquete] falló sin importar con proxy o sin proxy

Question

Ambiente

Windows 1903 WSL (kali) python3.7

Descripción

cuando se utiliza pip3 install flaskla pantalla de salida como tal

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyE
rror('Cannot connect to proxy.', NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7f7
d8da46ad0>: Failed to establish a new connection: [Errno 111] Connection refused'))': /simple/flask/

Adición

No se configuran variables de entorno en wsl.