error when installed opencv

hello i have a problem when i try to install opencv with pip3, i am using linux distribution derived from devian, when i run the code i get the following error and i don’t know what it can mean or how to solve it:

Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by ‘NewConnectionError(’<urllib3.connection.VerifiedHTTPSConnection object at 0xb623678c>: Failed to establish a new connection: [Errno -2] Nombre o servicio desconocido’)’: /simple/opencv/

Could not install packages due to an EnvironmentError: 404 Client Error: Not Found for url:

please help me :frowning: