If you are using Ubuntu or one of the Ubuntu based Linux Distro's you may not want to install or see that there is a new release version.

What I found is that if you update a Ubuntu based distro's with the new release version it could break some of the custom changes the Ubuntu based distro's has made. Sometimes you can't even boot properly, back into the distro.

This is how you can disable the message.

At a command prompt

$ sudo nano /etc/update-manager/release-upgrades or use what ever editor you like.

Find and replace normal with never save file. Restart the update manager and the release upgrade is gone.

Found this information at askubuntu.com