Localhost : getting ERR_CONNECTION_REFUSED

Hello
I upgraded my OS from ubuntu 20.04 to 20.10.
Now, i’m getting the error ERR_CONNECTION_REFUSED on localhost

Why? I didn’t touch my config docker.

What happens?
Can you explain to me?

I hope resolve this week.

I need to you.

Thanks you a lot
My best regards
Gilles

Hi
excuse moi
have you some responses?
Best regards

Hi
I need you
please
help me
thank a lot