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I have tried using bellow command but getting errors

• Command 1:

composer require magento/product-community-edition 2.3.0 --no-update

• Command 2:

composer update

Output:

Problem 1

    - Installation request for magento/product-community-edition 2.3.0 -> satisfiable by magento/product-community-edition[2.3.0].

    - magento/product-community-edition 2.3.0 requires magento/framework 102.0.0 -> satisfiable by magento/framework[102.0.0].

    - Conclusion: don't install symfony/console v2.8.38

    - Conclusion: don't install symfony/console v4.1.0-BETA2|install symfony/console v2.8.38

    - Conclusion: don't install symfony/console v4.1.0-BETA3|install symfony/console v2.8.38

    - Conclusion: don't install symfony/console v4.1.0|install symfony/console v2.8.38

    - Conclusion: don't install symfony/console v4.1.1|install symfony/console v2.8.38

    - Conclusion: don't install symfony/console v4.1.2|install symfony/console v2.8.38

    - Conclusion: don't install symfony/console v4.1.3|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

if anyone has an idea help me..!

I think you are skipping some steps.
Make sure you are specifying additional packages required :

composer require --dev phpunit/phpunit:~6.2.0 friendsofphp/php-cs-fixer:~2.10.1 lusitanian/oauth:~0.8.10 pdepend/pdepend:2.5.2 sebastian/phpcpd:~3.0.0 squizlabs/php_codesniffer:3.2.2 --no-update

and remove unused packages :

composer remove --dev sjparkinson/static-review fabpot/php-cs-fixer --no-update

You are getting the error mainly because of the fabpot/php-cs-fixer

Also, make sure you read Magento docs

https://devdocs.magento.com/guides/v2.3/comp-mgr/cli/cli-upgrade.html

Hope this helps.

Here are the steps to upgrade Magento 2.2.x to 2.3.0

Step 1: Backup code and database

Step 2:

composer require magento/product-community-edition=2.3.0 --no-update

Step 3:

composer require --dev phpunit/phpunit:~6.2.0 friendsofphp/php-cs-fixer:~2.10.1 lusitanian/oauth:~0.8.10 pdepend/pdepend:2.5.2 sebastian/phpcpd:~3.0.0 squizlabs/php_codesniffer:3.2.2 --no-update

Step 4:

composer remove --dev sjparkinson/static-review fabpot/php-cs-fixer --no-update

Step 5:
add “ZendMvcController”: “setup/src/Zend/Mvc/Controller/”: around line 47 under psr-4 section.

Step 6:

composer update

Detail information found on this post

With all the new stuff coming to Magento 2.3.0 you might want to try out the upgrade process to the latest 2.3.0 release. Before you start, see this infograph to know the steps to upgrade from Magento 2.2 to Magento 2.3.

Here are the steps I used to successfully update Magento 2.2.6 to 2.3.0. I have divided the steps into two parts:

Part 1:

• php bin/magento deploy:mode:set developer


• php bin/magento cache:disable


• php bin/magento maintenance:enable


• composer require magento/product-community-edition 2.3.0 --no-update


• composer update

POSSIBLE ERROR: You might get the following error:
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, v4.1.9].
- Conclusion: don't install sebastian/phpcpd 2.0.4|don't install symfony/console v4.1.1|install symfony/console v2.8.38
- Installation request for sebastian/phpcpd 2.0.4 -> satisfiable by sebastian/phpcpd[2.0.4].

GOTO PART 2 FOR SOLUTION

Part 2:

• 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); $autoload["autoload"]["psr-4"]["ZendMvcController"]= "setup/src/Zend/Mvc/Controller/"; file_put_contents("composer.json", json_encode($autoload, JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));'


• composer update


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


• php bin/magento setup:upgrade


• php bin/magento setup:di:compile


• php bin/magento cache:enable


• php bin/magento maintenance:disable


• php bin/magento indexer:reindex && php bin/magento cache:clean && php bin/magento cache:flush

Now, Magento 2.2.6 should have been SUCCESSFULLY UPGRADED to MAGENTO 2.3.0

To Upgrade From Magento 2.2 To Magento 2.3, We need out to follow some steps that can be helpful for us. Just click on above link and and make be better to upgrade your Magento version.