Disabling Auto Updates in Ubuntu
I'm OK mate, I know how to, and periodically remember to run apt-get update && apt-get upgrade to update my system. I don't need you to come along and _remind_ me that I need to do it!
If this speaks to you then just make the following change in
/etc/apt/apt.conf.d/10periodic set APT::Periodic::Update-Package-Lists to 0!!!