Get https://registry-1.docker.io/v2/: x509: certificate signed by unknown authority

Docker for Azure
1

Expected behavior

Actual behavior

Additional Information

Steps to reproduce the behavior

  1. …Trying to pull a docker image – hyperledger/fabric-orderer:1.4.3 - sudo docker pull fabric-orderer:1.4.3

  2. …Error response from daemon: Get https://registry-1.docker.io/v2/: x509: certificate signed by unknown authority

OS - Ubuntu 16.04 LTS
Docker version – 19.03.1

Earlier it was working fine. Now i am not sure why its not working.