Docker pull results in "Request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)"

[ngcdev]

I retract that it has to do with the docker client. It has to do with the DNS resolver in Ubuntu 18 (my system). I started noticing some requests taking a long time in Postman for something else and that’s when I realized that DNS lookup was taking the longest time.
I put a hard-coded DNS in resolve (as mentioned before) and that fixed it.