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i'm upgrading to Magento 2.2.2.

After:

# composer require magento/product-community-edition 2.2.2 --no-update

and:

# composer update

I received:

Your requirements could not be resolved to an installable set of packages. 

Problem 1
 - The requested package magento/product-community-edition could not be found in any version, there may be a typo in the package name.

Potential causes: 
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.

Read
<https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

So I downloaded the RC from github and used his composer.json.

With this the update has started to download the new packages.

Then I cleaned:

# rm -rf var/cache/*
# rm -rf var/page_cache/*
# rm -rf var/generation/*

But trying to launch some command from CLI gives me the following error:

Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for Magento\Setup\Mvc\Bootstrap\InitParamListener#0 /home/pippo/public_html/vendor/zendframework/zend-mvc/src/Application.php(156): Zend\ServiceManager\ServiceManager->get('Magento\\Setup\\M...') 
#1 /home/pippo/public_html/vendor/zendframework/zend-mvc/src/Application.php(281): Zend\Mvc\Application->bootstrap(Array) 
#2 /home/pippo/public_html/lib/internal/Magento/Framework/Console/Cli.php(57): Zend\Mvc\Application::init(Array) 
#3 /home/pippo/public_html/bin/magento(22): Magento\Framework\Console\Cli->__construct('Magento CLI') 
#4 {main}
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Magento 2 can only be downloaded from the Magento servers, they require autentication. You'll have to get your public and private keys from Magento first. More info here.

If you've already done this, can you add upload composer.json here? Maybe there's an issue there. For example the Magento repo can be missing under repositories. Example:

"Magento Marketplace": {
  "type": "composer",
  "url": "https://repo.magento.com/"
}

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