Docker no pull access error

Problem

A Docker pull command to Docker hub that worked fine for all users failed only for one user. When she tried to pull, it threw up this error:

repository some_org/some_image not found: does not exist or no pull access
The push refers to a repository [docker.io/some_org/some_image]

Docker hub authentication and other details seemed to be in order.

Solution

Turns out this user had run some docker commands before adding the Docker hub authentication. Those early commands had created a ~/.docker directory. Details from this were conflicting with Docker hub authentication that was introduced later. Removing this directory fixed the issue.

Tried with: Docker 1.11 and Ubuntu 14.04