Unable to login to docker via Ubuntu 18.04.5 LTS - docker

Question

I am having an issue on login to docker from my Ubuntu 18.04.5 LTS
This is the command I run to login docker
sudo docker login -u myname -p mypass
This is the error I've got
Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
I did searches on google and seems it is not quite a common issue to everyone.
This is my docker version
Client: Docker Engine - Community
Version: 19.03.12
API version: 1.40
Go version: go1.13.10
Git commit: 48a66213fe
Built: Mon Jun 22 15:45:36 2020
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 19.03.12
API version: 1.40 (minimum version 1.12)
Go version: go1.13.10
Git commit: 48a66213fe
Built: Mon Jun 22 15:44:07 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683
Basically, there are what I have done so far:
run sudo docker run hello-world to verify that my docker is runner properly
Hello from Docker!
This message shows that your installation appears to be working correctly.
...
run sudo vi ~/.docker/config.json to add "HttpHeaders
{
"auths": {},
"HttpHeaders": {
"User-Agent": "Docker-Client/19.03.12 (linux)"
}
}
run sudo vi /etc/docker/daemon.json to add dns then reload daemon and restar docker
{
"dns": ["8.8.8.8","8.8.4.4" ]
}
run curl https://registry-1.docker.io/v2/ and sure enough I've got this
{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":null}]}
As people were talking about proxy server, I also did a test run curl https://google.com aand get respons, does it mean that my server is not reside behind a proxy?
Unfortunately, after try several combinations of above solutions, I'm still not able to login to docker.
Does anyone has any advice?