I'm on 14.04 LTS; today the updater wanted a 15.10 CD/DVD even though I have notifications in "Software & Updates" set to notify me for LTS versions only.
I probably don't want to go to 15.10 as I heard the update path is arduous. I hope the update directly to 16.04 LTS is not too bad.
I've read people saying not to update at all, but to do a fresh install. I hope that if an update is offered, it works. I don't have a separate /home partition so a fresh install looks difficult to me. Maybe I could rearrange things but I have everything encrypted so I'd just prefer to leave as is.
Anyway I am wondering if I should just ignore Software Updater until 16.04 LTS is available, since I want nothing to do with 15.10.