mitchellh/vagrant — pull request #4565 by dup2 (2014-09-26 12:15:03+00:00)
Title: A more reliable way to detect Ubuntu via lsb_release

The default `/etc/issue` might have been changed by the administrator and not contain the string 'Ubuntu' anymore. The tool `lsb_release` is the recommended tool from the Linux Standards Base (LSB) project.