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I am trying to update Magento from version 2.2.6 to 2.3, but i get this errors:

sh-4.2# composer require magento/product-community-edition 2.3.0 --no-update
./composer.json has been updated

sh-4.2# composer update
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
- The requested package magento/magento-cloud-metapackage 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.
- It's a private package and you forgot to add a custom repository to find it

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

This is the composer version:

sh-4.2# composer --version
Composer version 1.7.3 2018-11-01 10:05:06

And this is the composer file.

sh-4.2# more composer.json

{

    "name": "magento/project-community-edition",

    "description": "eCommerce Platform for Growth (Community Edition)",

    "type": "project",

    "version": "2.1.7",

    "license": [

        "OSL-3.0",

        "AFL-3.0"

    ],

    "require": {

        "magento/product-community-edition": "2.3.0",

        "composer/composer": "@alpha",

        "codeko/redsys": "3.0.6",

        "eusonlito/magento2-language-es_es": "^0.0.8",

        "mageplaza/magento-2-spanish-language-pack": "dev-master",

        "lcbrq/magento2-dateformatpatch": "^1.0",

        "magento/magento-cloud-metapackage": "2.3.0"

    },

    "require-dev": {

        "phpunit/phpunit": "~6.2.0",

        "squizlabs/php_codesniffer": "3.2.2",

        "phpmd/phpmd": "@stable",

        "pdepend/pdepend": "2.5.2",

        "lusitanian/oauth": "~0.8.10",

        "sebastian/phpcpd": "~3.0.0",

        "friendsofphp/php-cs-fixer": "~2.10.1"

    },

    "config": {

        "use-include-path": true

    },

    "autoload": {

        "psr-4": {

            "Magento\Framework\": "lib/internal/Magento/Framework/",

            "Magento\Setup\": "setup/src/Magento/Setup/",

            "Magento\": "app/code/Magento/",

            "Zend\Mvc\Controller\": "setup/src/Zend/Mvc/Controller/"

        },

        "psr-0": {

            "": "app/code/"

        },

        "files": [

            "app/etc/NonComposerComponentRegistration.php"

        ]

    },

    "autoload-dev": {

        "psr-4": {

            "Magento\Sniffs\": "dev/tests/static/framework/Magento/Sniffs/",

            "Magento\Tools\": "dev/tools/Magento/Tools/",

            "Magento\Tools\Sanity\": "dev/build/publication/sanity/Magento/Tools/Sanity/",

            "Magento\TestFramework\Inspection\": "dev/tests/static/framework/Magento/TestFramework/Inspection/",

            "Magento\TestFramework\Utility\": "dev/tests/static/framework/Magento/TestFramework/Utility/"

        }

    },

    "minimum-stability": "alpha",

    "prefer-stable": true,

    "repositories": {

        "0": {

            "type": "composer",

            "url": "https://repo.magento.com/"

        },

        "magento": {

            "type": "composer",

            "url": "https://repo.magento.com/packages.json"

        }

    },

    "extra": {

        "magento-force": "override"

    }

}

Any idea?

Regards,
JOINSO

Solved following this steps:

Come back to the previous version of composer.json
Following instruction from How to Upgrade magento version from 2.2.X to 2.3.0?

In the last step, it says: sjparkinson/static-review is not required in your composer.json and has not been removed fabpot/php-cs-fixer is not required in your composer.json and has not been removed

Run: # composer upgrade

Then you can get errors like this when you try to do:

php bin/magento setup:upgrade ... Class 'ZendMvcControllerLazyControllerAbstractFactory' not found ...

So you must to edit the composer.json file and modify the autoload section:

"autoload": { "psr-4": { "MagentoFramework": "lib/internal/Magento/Framework/", "MagentoSetup": "setup/src/Magento/Setup/", "Magento": "app/code/Magento/", "ZendMvcController": "setup/src/Zend/Mvc/Controller/" }

Then run:

composer dumpautoload

And rerun:

php bin/magento setup:upgrade

And it works!

Regards,
JOINSO