Canonical provides a minimal Ubuntu install CD. It’s smaller than the regular installation ISO and it installs a minimal version of the distribution. At its most basic, it gives the user a command line, network connectivity and not much else. From this bare-bones beginning, it’s possible to selectively add components while leaving out most of the cruft that tends to come with a standard distribution.
There a few reasons why you might want to build your own distribution. You might want to build a custom install CD to match the policy of your organisation. For example, a GNOME desktop with Chrome as the web browser might be the standard desktop where you work. That touches on another motivation for wanting to create a customised installer: sometimes the creator of the distribution makes a decision that you simply don’t like. Canonical’s decision to switch to its own UI, Unity, ranks amongst its most controversial decisions. However, by using some of the methods that we explore here, you could create a distribution that is standard Ubuntu, but with a traditional desktop that you are more comfortable with.
There are other, niche reasons for wanting to build your own distribution. You might need to put something small and lightweight together for an older computer. You might need to build a live media ISO that you are able to carry around with you and to bring your favourite set of tools to bear when you need them.
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Oh, one last comment about UEFI boot to close this post. As was the case with the previous Mint 16 release, the UEFI boot directory will be named 'ubuntu', so if you want to install Mint 17 and Ubuntu both on the same UEFI boot system, you will have to be careful about that.
The most obvious solution, renaming the boot directory after the first of them is installed, doesn't work (it won't boot that one any more). The solution I have found which does work is to create a second EFI Boot partition, but neither Ubuntu nor Mint will let you specify the UEFI boot partition to use on installation, so you have to copy the boot directory to the second EFI partition after installing. This is not a big deal, if you are "advanced" enough to be installing both distributions on one system, then you should also be able to handle this.