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Today magento 2.3.0 was officially released. I tried to upgrade from 2.2.6 > 2.3.0 but failed. Tried to upgrade from 2.2.6 > 2.2.7 and it succeeded with no issues. tried again 2.2.7 > 2.3.0 and got the same error I had when I tried the upgrade from 2.2.6 > 2.3.0.

Error from Web Setup Wizzard - System Upgrade

Command "update" failed: You are running composer with xdebug
enabled. This has a major impact on runtime performance. See
https://getcomposer.org/xdebug 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
- magento/product-community-edition 2.3.0 requires magento/magento2-base 2.3.0 -> satisfiable by
magento/magento2-base[2.3.0].
- Conclusion: don't install symfony/console v2.8.38
- Conclusion: don't install symfony/console v4.1.4|install symfony/console v2.8.38
- Conclusion: don't install symfony/console v4.1.5|install symfony/console v2.8.38
- Conclusion: don't install symfony/console v4.1.6|install symfony/console v2.8.38
- Conclusion: don't install symfony/console v4.1.7|install symfony/console v2.8.38
- Installation request for magento/product-community-edition 2.3.0 -> satisfiable by magento/product-community-edition[2.3.0].
- Conclusion: don't install symfony/console v4.1.8|install symfony/console v2.8.38
- Conclusion: don't install symfony/console v3.4.19|install symfony/console v4.1.4|install symfony/console v4.1.5|install
symfony/console v4.1.6|install symfony/console v4.1.7|install
symfony/console v4.1.8
- Conclusion: don't install symfony/console v4.1.1|install symfony/console v2.8.38|install symfony/console v3.4.19
- Installation request for sebastian/phpcpd 2.0.4 -> satisfiable by sebastian/phpcpd[2.0.4].
- Conclusion: don't install symfony/console v4.1.3|install symfony/console v2.8.38|install symfony/console v3.4.19
- sebastian/phpcpd 2.0.4 requires symfony/console ~2.7|^3.0 -> satisfiable by symfony/console[v2.7.0, v2.7.1, v2.7.10, v2.7.11,
v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.17, v2.7.18,
v2.7.19, v2.7.2, v2.7.20, v2.7.21, v2.7.22, v2.7.23, v2.7.24, v2.7.25,
v2.7.26, v2.7.27, v2.7.28, v2.7.29, v2.7.3, v2.7.30, v2.7.31, v2.7.32,
v2.7.33, v2.7.34, v2.7.35, v2.7.36, v2.7.37, v2.7.38, v2.7.39, v2.7.4,
v2.7.40, v2.7.41, v2.7.42, v2.7.43, v2.7.44, v2.7.45, v2.7.46,
v2.7.47, v2.7.48, v2.7.49, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9,
v2.8.0, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15,
v2.8.16, v2.8.17, v2.8.18, v2.8.19, v2.8.2, v2.8.20, v2.8.21, v2.8.22,
v2.8.23, v2.8.24, v2.8.25, v2.8.26, v2.8.27, v2.8.28, v2.8.29, v2.8.3,
v2.8.30, v2.8.31, v2.8.32, v2.8.33, v2.8.34, v2.8.35, v2.8.36,
v2.8.37, v2.8.38, v2.8.39, v2.8.4, v2.8.40, v2.8.41, v2.8.42, v2.8.43,
v2.8.44, v2.8.45, v2.8.46, v2.8.47, v2.8.48, v2.8.5, v2.8.6, v2.8.7,
v2.8.8, v2.8.9, v3.0.0, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5,
v3.0.6, v3.0.7, v3.0.8, v3.0.9, v3.1.0, v3.1.1, v3.1.10, v3.1.2,
v3.1.3, v3.1.4, v3.1.5, v3.1.6, v3.1.7, v3.1.8, v3.1.9, v3.2.0,
v3.2.1, v3.2.10, v3.2.11, v3.2.12, v3.2.13, v3.2.14, v3.2.2, v3.2.3,
v3.2.4, v3.2.5, v3.2.6, v3.2.7, v3.2.8, v3.2.9, v3.3.0, v3.3.1,
v3.3.10, v3.3.11, v3.3.12, v3.3.13, v3.3.14, v3.3.15, v3.3.16,
v3.3.17, v3.3.18, v3.3.2, v3.3.3, v3.3.4, v3.3.5, v3.3.6, v3.3.7,
v3.3.8, v3.3.9, v3.4.0, v3.4.1, v3.4.10, v3.4.11, v3.4.12, v3.4.13,
v3.4.14, v3.4.15, v3.4.16, v3.4.17, v3.4.18, v3.4.19, v3.4.2, v3.4.3,
v3.4.4, v3.4.5, v3.4.6, v3.4.7, v3.4.8, v3.4.9].
- Can only install one of: symfony/console[v4.1.0, v2.7.0].
- Can only install one of: symfony/console[v4.1.0, v2.7.1].
- Can only install one of: symfony/console[v4.1.0, v2.7.10].
- Can only install one of: symfony/console[v4.1.0, v2.7.11].
- Can only install one of: symfony/console[v4.1.0, v2.7.12].
- Can only install one of: symfony/console[v4.1.0, v2.7.13].
- Can only install one of: symfony/console[v4.1.0, v2.7.14].
- Can only install one of: symfony/console[v4.1.0, v2.7.15].
- Can only install one of: symfony/console[v4.1.0, v2.7.16].
- Can only install one of: symfony/console[v4.1.0, v2.7.17].
- Can only install one of: symfony/console[v4.1.0, v2.7.18].
- Can only install one of: symfony/console[v4.1.0, v2.7.19].
- Can only install one of: symfony/console[v4.1.0, v2.7.2].
- Can only install one of: symfony/console[v4.1.0, v2.7.20].
- Can only install one of: symfony/console[v4.1.0, v2.7.21].
- Can only install one of: symfony/console[v4.1.0, v2.7.22].
- Can only install one of: symfony/console[v4.1.0, v2.7.23].
- Can only install one of: symfony/console[v4.1.0, v2.7.24].
- Can only install one of: symfony/console[v4.1.0, v2.7.25].
- Can only install one of: symfony/console[v4.1.0, v2.7.26].
- Can only install one of: symfony/console[v4.1.0, v2.7.27].
- Can only install one of: symfony/console[v4.1.0, v2.7.28].
- Can only install one of: symfony/console[v4.1.0, v2.7.29].
- Can only install one of: symfony/console[v4.1.0, v2.7.3].
- Can only install one of: symfony/console[v4.1.0, v2.7.30].
- Can only install one of: symfony/console[v4.1.0, v2.7.31].
- Can only install one of: symfony/console[v4.1.0, v2.7.32].
- Can only install one of: symfony/console[v4.1.0, v2.7.33].
- Can only install one of: symfony/console[v4.1.0, v2.7.34].
- Can only install one of: symfony/console[v4.1.0, v2.7.35].
- Can only install one of: symfony/console[v4.1.0, v2.7.36].
- Can only install one of: symfony/console[v4.1.0, v2.7.37].
- Can only install one of: symfony/console[v4.1.0, v2.7.38].
- Can only install one of: symfony/console[v4.1.0, v2.7.39].
- Can only install one of: symfony/console[v4.1.0, v2.7.4].
- Can only install one of: symfony/console[v4.1.0, v2.7.40].
- Can only install one of: symfony/console[v4.1.0, v2.7.41].
- Can only install one of: symfony/console[v4.1.0, v2.7.42].
- Can only install one of: symfony/console[v4.1.0, v2.7.43].
- Can only install one of: symfony/console[v4.1.0, v2.7.44].
- Can only install one of: symfony/console[v4.1.0, v2.7.45].
- Can only install one of: symfony/console[v4.1.0, v2.7.46].
- Can only install one of: symfony/console[v4.1.0, v2.7.47].
- Can only install one of: symfony/console[v4.1.0, v2.7.48].
- Can only install one of: symfony/console[v4.1.0, v2.7.49].
- Can only install one of: symfony/console[v4.1.0, v2.7.5].
- Can only install one of: symfony/console[v4.1.0, v2.7.6].
- Can only install one of: symfony/console[v4.1.0, v2.7.7].
- Can only install one of: symfony/console[v4.1.0, v2.7.8].
- Can only install one of: symfony/console[v4.1.0, v2.7.9].
- Can only install one of: symfony/console[v4.1.0, v2.8.0].
- Can only install one of: symfony/console[v4.1.0, v2.8.1].
- Can only install one of: symfony/console[v4.1.0, v2.8.10].
- Can only install one of: symfony/console[v4.1.0, v2.8.11].
- Can only install one of: symfony/console[v4.1.0, v2.8.12].
- Can only install one of: symfony/console[v4.1.0, v2.8.13].
- Can only install one of: symfony/console[v4.1.0, v2.8.14].
- Can only install one of: symfony/console[v4.1.0, v2.8.15].
- Can only install one of: symfony/console[v4.1.0, v2.8.16].
- Can only install one of: symfony/console[v4.1.0, v2.8.17].
- Can only install one of: symfony/console[v4.1.0, v2.8.18].
- Can only install one of: symfony/console[v4.1.0, v2.8.19].
- Can only install one of: symfony/console[v4.1.0, v2.8.2].
- Can only install one of: symfony/console[v4.1.0, v2.8.20].
- Can only install one of: symfony/console[v4.1.0, v2.8.21].
- Can only install one of: symfony/console[v4.1.0, v2.8.22].
- Can only install one of: symfony/console[v4.1.0, v2.8.23].
- Can only install one of: symfony/console[v4.1.0, v2.8.24].
- Can only install one of: symfony/console[v4.1.0, v2.8.25].
- Can only install one of: symfony/console[v4.1.0, v2.8.26].
- Can only install one of: symfony/console[v4.1.0, v2.8.27].
- Can only install one of: symfony/console[v4.1.0, v2.8.28].
- Can only install one of: symfony/console[v4.1.0, v2.8.29].
- Can only install one of: symfony/console[v4.1.0, v2.8.3].
- Can only install one of: symfony/console[v4.1.0, v2.8.30].
- Can only install one of: symfony/console[v4.1.0, v2.8.31].
- Can only install one of: symfony/console[v4.1.0, v2.8.32].
- Can only install one of: symfony/console[v4.1.0, v2.8.33].
- Can only install one of: symfony/console[v4.1.0, v2.8.34].
- Can only install one of: symfony/console[v4.1.0, v2.8.35].
- Can only install one of: symfony/console[v4.1.0, v2.8.36].
- Can only install one of: symfony/console[v4.1.0, v2.8.37].
- Can only install one of: symfony/console[v4.1.0, v2.8.39].
- Can only install one of: symfony/console[v4.1.0, v2.8.4].
- Can only install one of: symfony/console[v4.1.0, v2.8.40].
- Can only install one of: symfony/console[v4.1.0, v2.8.41].
- Can only install one of: symfony/console[v4.1.0, v2.8.42].
- Can only install one of: symfony/console[v4.1.0, v2.8.43].
- Can only install one of: symfony/console[v4.1.0, v2.8.44].
- Can only install one of: symfony/console[v4.1.0, v2.8.45].
- Can only install one of: symfony/console[v4.1.0, v2.8.46].
- Can only install one of: symfony/console[v4.1.0, v2.8.47].
- Can only install one of: symfony/console[v4.1.0, v2.8.48].
- Can only install one of: symfony/console[v4.1.0, v2.8.5].
- Can only install one of: symfony/console[v4.1.0, v2.8.6].
- Can only install one of: symfony/console[v4.1.0, v2.8.7].
- Can only install one of: symfony/console[v4.1.0, v2.8.8].
- Can only install one of: symfony/console[v4.1.0, v2.8.9].
- Can only install one of: symfony/console[v4.1.0, v3.0.0].
- Can only install one of: symfony/console[v4.1.0, v3.0.1].
- Can only install one of: symfony/console[v4.1.0, v3.0.2].
- Can only install one of: symfony/console[v4.1.0, v3.0.3].
- Can only install one of: symfony/console[v4.1.0, v3.0.4].
- Can only install one of: symfony/console[v4.1.0, v3.0.5].
- Can only install one of: symfony/console[v4.1.0, v3.0.6].
- Can only install one of: symfony/console[v4.1.0, v3.0.7].
- Can only install one of: symfony/console[v4.1.0, v3.0.8].
- Can only install one of: symfony/console[v4.1.0, v3.0.9].
- Can only install one of: symfony/console[v4.1.0, v3.1.0].
- Can only install one of: symfony/console[v4.1.0, v3.1.1].
- Can only install one of: symfony/console[v4.1.0, v3.1.10].
- Can only install one of: symfony/console[v4.1.0, v3.1.2].
- Can only install one of: symfony/console[v4.1.0, v3.1.3].
- Can only install one of: symfony/console[v4.1.0, v3.1.4].
- Can only install one of: symfony/console[v4.1.0, v3.1.5].
- Can only install one of: symfony/console[v4.1.0, v3.1.6].
- Can only install one of: symfony/console[v4.1.0, v3.1.7].
- Can only install one of: symfony/console[v4.1.0, v3.1.8].
- Can only install one of: symfony/console[v4.1.0, v3.1.9].
- Can only install one of: symfony/console[v4.1.0, v3.2.0].
- Can only install one of: symfony/console[v4.1.0, v3.2.1].
- Can only install one of: symfony/console[v4.1.0, v3.2.10].
- Can only install one of: symfony/console[v4.1.0, v3.2.11].
- Can only install one of: symfony/console[v4.1.0, v3.2.12].
- Can only install one of: symfony/console[v4.1.0, v3.2.13].
- Can only install one of: symfony/console[v4.1.0, v3.2.14].
- Can only install one of: symfony/console[v4.1.0, v3.2.2].
- Can only install one of: symfony/console[v4.1.0, v3.2.3].
- Can only install one of: symfony/console[v4.1.0, v3.2.4].
- Can only install one of: symfony/console[v4.1.0, v3.2.5].
- Can only install one of: symfony/console[v4.1.0, v3.2.6].
- Can only install one of: symfony/console[v4.1.0, v3.2.7].
- Can only install one of: symfony/console[v4.1.0, v3.2.8].
- Can only install one of: symfony/console[v4.1.0, v3.2.9].
- Can only install one of: symfony/console[v4.1.0, v3.3.0].
- Can only install one of: symfony/console[v4.1.0, v3.3.1].
- Can only install one of: symfony/console[v4.1.0, v3.3.10].
- Can only install one of: symfony/console[v4.1.0, v3.3.11].
- Can only install one of: symfony/console[v4.1.0, v3.3.12].
- Can only install one of: symfony/console[v4.1.0, v3.3.13].
- Can only install one of: symfony/console[v4.1.0, v3.3.14].
- Can only install one of: symfony/console[v4.1.0, v3.3.15].
- Can only install one of: symfony/console[v4.1.0, v3.3.16].
- Can only install one of: symfony/console[v4.1.0, v3.3.17].
- Can only install one of: symfony/console[v4.1.0, v3.3.18].
- Can only install one of: symfony/console[v4.1.0, v3.3.2].
- Can only install one of: symfony/console[v4.1.0, v3.3.3].
- Can only install one of: symfony/console[v4.1.0, v3.3.4].
- Can only install one of: symfony/console[v4.1.0, v3.3.5].
- Can only install one of: symfony/console[v4.1.0, v3.3.6].
- Can only install one of: symfony/console[v4.1.0, v3.3.7].
- Can only install one of: symfony/console[v4.1.0, v3.3.8].
- Can only install one of: symfony/console[v4.1.0, v3.3.9].
- Can only install one of: symfony/console[v4.1.0, v3.4.0].
- Can only install one of: symfony/console[v4.1.0, v3.4.1].
- Can only install one of: symfony/console[v4.1.0, v3.4.10].
- Can only install one of: symfony/console[v4.1.0, v3.4.11].
- Can only install one of: symfony/console[v4.1.0, v3.4.12].
- Can only install one of: symfony/console[v4.1.0, v3.4.13].
- Can only install one of: symfony/console[v4.1.0, v3.4.14].
- Can only install one of: symfony/console[v4.1.0, v3.4.15].
- Can only install one of: symfony/console[v4.1.0, v3.4.16].
- Can only install one of: symfony/console[v4.1.0, v3.4.17].
- Can only install one of: symfony/console[v4.1.0, v3.4.18].
- Can only install one of: symfony/console[v4.1.0, v3.4.2].
- Can only install one of: symfony/console[v4.1.0, v3.4.3].
- Can only install one of: symfony/console[v4.1.0, v3.4.4].
- Can only install one of: symfony/console[v4.1.0, v3.4.5].
- Can only install one of: symfony/console[v4.1.0, v3.4.6].
- Can only install one of: symfony/console[v4.1.0, v3.4.7].
- Can only install one of: symfony/console[v4.1.0, v3.4.8].
- Can only install one of: symfony/console[v4.1.0, v3.4.9].
- magento/magento2-base 2.3.0 requires symfony/console ~4.1.0 -> satisfiable by symfony/console[v4.1.0, v4.1.1, v4.1.2, v4.1.3, v4.1.4,
v4.1.5, v4.1.6, v4.1.7, v4.1.8].
- Conclusion: don't install symfony/console v4.1.2|install symfony/console v2.8.38|install symfony/console v3.4.19

Any idea how to fix this?

I found the solution. Here are the commands to run to fix the issue:

composer config preferred-install dist

composer config sort-packages true

composer config prefer-stable true

composer require --dev friendsofphp/php-cs-fixer:~2.10.0 --no-update

composer require --dev sebastian/phpcpd:~3.0.0 --no-update

php -r '$autoload=json_decode(file_get_contents("composer.json"), true); $autoload["autoload"]["psr-4"]["Zend\Mvc\Controller\"]= "setup/src/Zend/Mvc/Controller/"; file_put_contents("composer.json", json_encode($autoload, JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));'