Path "%1" must be writable.

[ooxi]

Installation using install.php fails if not writeable directories are detected with an incomplete error message

error: Path "%1" must be writable.

It looks like the \Magento\Framework\Phrase renderer does not work since __ is invoked with

string(27) "Path "%1" must be writable."
array(1) {
  [0]=>
  string(29) "pub/media/theme_customization"
}

[mazhalai]

@ooxi install.php is being phased out. please try installing with the following command within the setup folder:

php -f index.php install --cleanup_database --db_host=localhost --db_name=magento2 --db_user="admin" --db_pass="admin123" --backend_frontname=admin --base_url=http://127.0.0.1/ --language=en_US --timezone=America/Los_Angeles --currency=USD --admin_lastname=Smith --admin_firstname=John --admin_email=john.smith@example.com --admin_username=admin --admin_password=admin123 --use_secure=0

[ooxi]

Thanks @mazhalai, I will try. Is there any documentation on the recommended setup & configuration process? I more or less tried fixing every exception comming up (like when Magento checks for necessary php modules) instead of following a guide.

[mazhalai]

@ooxi the guide is still in the works.

Also, forgot to mention in the previous comment, please run composer install within the setup directory before the install command.

[maksek]

@ooxi for now you can take a look into wiki - https://wiki.magento.com/display/MAGE2DOC, it has outdated information, but still may help you with your questions. soon you will see updates into the repo - https://github.com/magento/devdocs, where all documentation will be located.

[maksek]

you may want to use web installation wizard, which located in /setup folder. Let me know if you need help with it.
Again, thanks for your time with M2 :)

[ooxi]

Closing this issue as the problem manifests itself in a deprecated source file. Thanks for the help!