The update is not offered to you because http://changelogs.ubuntu.com/meta-release-lts wasn't updated yet.
According to the release announcement "Users of Ubuntu 12.04 will soon be offered an automatic upgrade to 14.04.1 via Update Manager.", see https://lists.ubuntu.com/archives/ubuntu-announce/2014-July/000188.html
The update is not offered to you because http:// changelogs. ubuntu. com/meta- release- lts wasn't updated yet.
According to the release announcement "Users of Ubuntu 12.04 will soon be offered an automatic upgrade to 14.04.1 via Update Manager.", see https:/ /lists. ubuntu. com/archives/ ubuntu- announce/ 2014-July/ 000188. html