This question already has an answer here:
I do have 12.04 LTS and hearing that 14.04 LTS was released I (wrongly) assumed that I will be able to upgrade machines using the standard distribution upgrade path.
Still it seems that 'sudo do-release-upgrade' does not see any new release.
Why it doesn't show it and when is this going to be visible?
Obviously, I do not want to force the usage of development / unstable versions.
Also, considering the 14.04 was released on April 17, why it was released when it was not considered "stable" yet? ... there is something in the release process that doesn't make sense to me :p