jbfink/docker-lampstack — pull request #3 by hamiltont (2014-04-18 01:16:24+00:00)
Title: Remove apt-get upgrade

Currently upgrade breaks the container build. Upgrading is
unrecommended inside a container, as there is no init system and
some packages have to be held back.

To see the official issue: https://github.com/dotcloud/docker/issues/1724
To see workarounds: https://github.com/racker/docker-ubuntu-with-updates/blob/master/precise/Dockerfile