[sf-lug] upgrade Ubuntu 12.04.x --> 14.04.x

[Daniel Gimpelevich]

On Mon, 2015-07-27 at 20:38 -0700, Michael Paoli wrote:
> With DVD/ISO can probably, like Debian, use apt-cdrom, so it will know
> about the available ISO image, and not download from Internet what it
> can retrieve from optical drive.  But should still get additional
> updates
> (e.g. security updates, critical bug fixes) from The Internet, to
> cover
> what's not yet made it to released DVD ISO.

That is how upgrading using an alternate installer disc worked under the
hood. The desktop installer discs are not APT repositories and cannot be
used this way.