I\'m trying to remove an image and I get:
# docker rmi f50f9524513f Failed to remove image (f50f9524513f): Error response from daemon: conflict: unable to
If you don't have a huge number of images, there's always the brute-force approach:
for i in $(docker images -q) do docker history $i | grep -q f50f9524513f && echo $i done | sort -u