Issue pulling Ubuntu 16.04 image

Has anyone been able to pull a docker image with 16.04?

Running the command:
$ docker run -it ubuntu:16.04 /bin/bash
gives me a shell, however running the command
$ uname -a
(output: Linux ad92d00ea18f 3.19.0-59-generic #65~14.04.1-Ubuntu SMP Tue Apr 19 18:57:09 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux)
shows that the version is still 14.04. I’ve tried switching ‘ubuntu:16.04’ to ‘ubuntu:latest’ and ‘ubuntu:xenial’ with the same result.

Is this a bug or am I missing something?

uname -a will return the version of the running kernel. If your host is running an ubuntu 14.04 kernel, you will see that in any uname output.