Symfony 4 fresh installation

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Check out the 2018 simpler version to get the Standard Edition !

Finally, Symfony 4 is out.
Basic Steps to get it running
composer, flex, routes, annotations, twig, toolbar, enjoy, solvedteamaker.
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i have lemp + php7.2-(fpm, mysql, cli) + composer and when i put
sudo composer create-project symfony/skeleton sf4-test 4.0.0
i got this:

Installing symfony/skeleton (v4.0.0)
- Installing symfony/skeleton (v4.0.0)
Loading from cache

Created project in sf4-test
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- symfony/flex v1.0.9 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.8 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.7 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.6 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.5 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.44 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.43 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.42 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.41 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.40 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.4 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.39 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.38 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.37 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.36 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.35 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.34 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.33 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.32 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.31 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.30 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.3 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.29 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.28 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.27 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.26 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.25 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.24 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.23 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.22 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.21 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.20 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.2 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.19 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.18 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.17 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.16 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.15 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.14 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.13 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.12 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.11 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.10 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.1 requires composer-plugin-api ^1.1 -> no matching package found.
- symfony/flex v1.0.0 requires composer-plugin-api ^1.1 -> no matching package found.
- Installation request for symfony/flex ^1.0 -> satisfiable by symfony/flex[v1.0.0, v1.0.1, v1.0.10, v1.0.11, v1.0.12, v1.0.13, v1.0.14, v1.0.15, v1.0.16, v1.0.17, v1.0.18, v1.0.19, v1.0.2, v1.0.20, v1.0.21, v1.0.22, v1.0.23, v1.0.24, v1.0.25, v1.0.26, v1.0.27, v1.0.28, v1.0.29, v1.0.3, v1.0.30, v1.0.31, v1.0.32, v1.0.33, v1.0.34, v1.0.35, v1.0.36, v1.0.37, v1.0.38, v1.0.39, v1.0.4, v1.0.40, v1.0.41, v1.0.42, v1.0.43, v1.0.44, v1.0.5, v1.0.6, v1.0.7, v1.0.8, v1.0.9].

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