Ubuntu 14.04 Trusty Tahr Alpha 1 includes a number of software updates that are ready for wider testing. This is quite an early set of images, so you should expect some bugs.
While these Alpha 1 images have been tested and work, except as noted in the release notes, Ubuntu developers are continuing to improve Trusty Tahr. In particular, once newer daily images are available, system installation bugs identified in the Alpha 1 installer should be verified against the current daily image before being reported in Launchpad.
Using an obsolete image to re-report bugs that have already been fixed wastes your time and the time of developers who are busy trying to make 14.04 the best Ubuntu release yet. Always ensure your system is up to date before reporting bugs.