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I'm upgrading Magento from 2.2.7 to 2.3.0 from composer.
Running in sequence

php bin/magento maintenance:enable 

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

composer update 

In the console I read several lines of error with sentences like

magento/framework 100.1.15 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.23) does not satisfy that requirement.

Can only install one of: magento/framework[102.0.0, 101.0.0].

I'm using php v7.1.23 and https://magento.com/tech-resources/download don't say nothing about issue on v 7.1.x.

So i don't understand why the upgrade isn't compatible.

How does this problem happen? Do I need to upgrade to php v7.2?

I had the same issue with php version conflict. In my case, I had to uninstall and install the php as upgrading via command line still caused the issue. Hope that helps!

i think you'll have to not pass the --no-update flag -- that tells composer to not update related packages.

magento/framework in m2.3 requires "php": "~7.1.3||~7.2.0" so that should resolve your issue.

Follow instructions as detailed in documentation https://devdocs.magento.com/guides/v2.3/comp-mgr/cli/cli-upgrade.html

I had the exact same problem. In my case part of the problem was that there are 2 Braintree extensions, one that is built in and is advanced. Gene writes both but the 2nd has Apple Pay included. The 2nd one is not compatible with 2.3.0 right now. I was able to get Magento 2.2.6 to 2.3.0 upgrade to work after a lot of trial and error. Here is the procedure I followed. 

Obviously backup everything first. I did it on a development copy first.

1. Update all extensions


2. run composer remove gene/module-braintree & composer remove paypal/module-braintree


3. composer update


4. composer require magento/module-braintree


5. composer update


6. Install Magento 2.2.7 (cannot go directly to 2.3.0)


7. compile, deploy and clean caches - check it works


8. Install Magento 2.3.0 by following these instructions, but DON'T run the composer update command. Make sure you remove the update folder and do that step, even though it says optional. https://devdocs.magento.com/guides/v2.3/comp-mgr/cli/cli-upgrade.html
   


9. Edit the composer.json file in the root.Remove any 3rd party repositories. Also remove any extensions you don't need. I found Sendgrid and Bronto were not compatible with 2.3 and only had to remove those. You will know if you try run "composer update" if it gives you any errors.


10. Run composer update


11. Once Magento 2.3.0 is installed, I found that it would not run any bin/magento commands. This was fixed by flushing redis. May be different for your server but mine was.
    redis-cli -s /var/run/redis-multi-a751baae.redis/redis.sock -n 0 FLUSHDB


12. compile, deploy and clear caches


13. I use WeltPixel Pearl theme and had to update that now for the site to work properly again.

I found one other issue with swatches not displaying and followed the instructions here to fix https://github.com/magento/magento2/issues/19688


Good Luck!