################################################################################
2018-04-09 19:43:25: Starting installation of the "core" upgrade package
2018-04-09 19:43:25: Upgrading version 4.3.4 to 4.3.5
2018-04-09 19:43:25: Running as user "www-data"
2018-04-09 19:43:25: Executing pre-upgrade validators
2018-04-09 19:43:25: Found 0 validators at package
2018-04-09 19:43:25: Executing "collisions" validator
2018-04-09 19:43:25: Executing "permissions" validator
2018-04-09 19:43:26: Executing "restore" validator
2018-04-09 19:43:26: Backup filename is "upg_core_4.3.4-4.3.5_09Apr2018_194325"
2018-04-09 19:43:26: Preparing restore script
2018-04-09 19:43:26: Upgrades directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:26: Source restore script permissions: -rw-r--r-- www-data:www-data
2018-04-09 19:43:26: Created directory for restore script at "/var/www/html/upgrades/core_4.3.4-4.3.5/"
2018-04-09 19:43:26: Directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:26: Created restore script at "/var/www/html/upgrades/core_4.3.4-4.3.5/restore_2018-04-09_19:43:25.php"
2018-04-09 19:43:26: Restore script permissions: -rw-r--r-- www-data:www-data
2018-04-09 19:43:26: Correcting target restore script directory permissions...
2018-04-09 19:43:26: ----------
2018-04-09 19:43:26: Changing permissions of "/var/www/html/upgrades/core_4.3.4-4.3.5/" to 755
2018-04-09 19:43:26: Using chmod()... OK
2018-04-09 19:43:26: ----------
2018-04-09 19:43:26: Target restore script directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:26: Correcting upgrades directory permissions...
2018-04-09 19:43:26: ----------
2018-04-09 19:43:26: Changing permissions of "/var/www/html/upgrades" to 755
2018-04-09 19:43:26: Using chmod()... OK
2018-04-09 19:43:26: ----------
2018-04-09 19:43:26: Upgrades directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:31: Executing pre-upgrade script "/var/www/html/var/upgrade/packages/core/content/scripts/pre_script.php"
2018-04-09 19:43:32: Preparing restore script
2018-04-09 19:43:32: Upgrades directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:32: Source restore script permissions: -rw-r--r-- www-data:www-data
2018-04-09 19:43:32: Created directory for restore script at "/var/www/html/upgrades/core_4.3.4-4.3.5/"
2018-04-09 19:43:32: Directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:32: Created restore script at "/var/www/html/upgrades/core_4.3.4-4.3.5/restore_2018-04-09_19:43:25.php"
2018-04-09 19:43:32: Restore script permissions: -rw-r--r-- www-data:www-data
2018-04-09 19:43:32: Correcting target restore script directory permissions...
2018-04-09 19:43:32: ----------
2018-04-09 19:43:32: Changing permissions of "/var/www/html/upgrades/core_4.3.4-4.3.5/" to 755
2018-04-09 19:43:32: Using chmod()... OK
2018-04-09 19:43:32: ----------
2018-04-09 19:43:32: Target restore script directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:32: Correcting upgrades directory permissions...
2018-04-09 19:43:32: ----------
2018-04-09 19:43:32: Changing permissions of "/var/www/html/upgrades" to 755
2018-04-09 19:43:32: Using chmod()... OK
2018-04-09 19:43:32: ----------
2018-04-09 19:43:32: Upgrades directory permissions: drwxr-xr-x www-data:www-data
2018-04-09 19:43:37: Pre-upgrade script executed successfully
2018-04-09 19:43:37: Closing storefront
2018-04-09 19:43:37: Backing up files and database
2018-04-09 19:54:35: Backup created at "/var/www/html/var/backups/upg_core_4.3.4-4.3.5_09Apr2018_194325.zip"
2018-04-09 19:54:36: Sending upgrade information e-mail to: service@g.com
2018-04-09 19:54:38: E-mail was successfully sent
2018-04-09 19:54:38: Copying package files
2018-04-09 19:54:49: Deleting files removed at new version
2018-04-09 19:54:49: Processing themes files
2018-04-09 19:54:49: Executing 19 migrations found at package
2018-04-09 19:54:49: PHP Warning: include(/var/www/html/app/lib/vendor/symfony/console/Symfony/Component/Console/Formatter/OutputFormatterStyleInterface.php): failed to open stream: No such file or directory in /var/www/html/app/lib/vendor/composer/ClassLoader.php on line 412
2018-04-09 19:54:50: PHP Warning: include(): Failed opening '/var/www/html/app/lib/vendor/symfony/console/Symfony/Component/Console/Formatter/OutputFormatterStyleInterface.php' for inclusion (include_path='/var/www/html/app/lib/pear/.:/usr/share/php') in /var/www/html/app/lib/vendor/composer/ClassLoader.php on line 412
2018-04-09 19:54:50: PHP Fatal Error: Interface 'Symfony\Component\Console\Formatter\OutputFormatterStyleInterface' not found in /var/www/html/app/lib/vendor/symfony/console/Symfony/Component/Console/Formatter/OutputFormatterStyle.php on line 22
And the winner is !!
/var/www/html/app/lib/vendor/symfony/console/Symfony/Component/Console/Formatter/OutputFormatterStyleInterface.php\
theres a slash and space in filename ? meaning a space somewhere in packaging of cs-cart.... 2 other files are like that.
which breaks the whole shebang