root@nemesis2:/etc/apt# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.4 LTS
Release:        12.04
Codename:       precise
root@nemesis2:/etc/apt# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@nemesis2:/etc/apt# apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@nemesis2:/etc/apt# tail -n 1 /etc/update-manager/release-upgrades
Prompt=lts
root@nemesis2:/etc/apt# do-release-upgrade
Checking for a new Ubuntu release
No new release found
root@nemesis2:/etc/apt#