How can I customize Ubuntu installation ? I don't want install Libre office or other app. I need something like Ubuntu server but without server tools .
The utterly simplest way is to install the Desktop version, then delete the un-needed apps in one pass with Synaptic. Select all excess applications, and have Synaptic do the work for you of removing the apps and their dependencies.
Otherwise, Ubuntu-Builder https://launchpad.net/ubuntu-builder allows you to strip out apps and dependencies, pre-installation. There's an established explanation here at How to customize the Ubuntu Live CD?
You want a minimal install to be able to install only what you require, the only issue is that is is not useful for installing in UEFI mode.
The more customization you want then the less ubuntu you need. I talking about Ubuntu minimal installation. Several times I have tried that .it just gives the core and everything you have to configure manually.
It will ask you while installation what software you would like to have , selected applications and tools only installs and nothing extra.