Installation error

[BonBonSlick]

....
  - Installing dealerdirect/phpcodesniffer-composer-installer (v0.4.4): Loading from cache
Plugin installation failed, rolling back
  - Removing dealerdirect/phpcodesniffer-composer-installer (v0.4.4)

                                                                                                                                                                                                    
  [Symfony\Component\Process\Exception\ProcessFailedException]                                                                                                                                      
  The command "'/var/www/sitename/vendor/bin/phpcs' '--config-show' 'installed_paths'" failed.                                                                                                        
                                                                                                                                                                                                    
  Exit Code: 255(Unknown error)                                                                                                                                                                     
                                                                                                                                                                                                    
  Working directory: /var/www/sitename                                                                                                                                                                
                                                                                                                                                                                                    
  Output:                                                                                                                                                                                           
  ================                                                                                                                                                                                  
                                                                                                                                                                                                    
                                                                                                                                                                                                    
  Error Output:                                                                                                                                                                                     
  ================                                                                                                                                                                                  
  PHP Warning:  require_once(/var/www/sitename/vendor/composer/autoload_real.php): failed to open stream: No such file or directory in /var/www/sitename/vendor/autoload.php on line 5                  
  PHP Stack trace:                                                                                                                                                                                  
  PHP   1. {main}() /var/www/sitename/vendor/squizlabs/php_codesniffer/bin/phpcs:0                                                                                                                    
  PHP   2. spl_autoload_call() /var/www/sitename/vendor/squizlabs/php_codesniffer/bin/phpcs:17                                                                                                        
  PHP   3. PHP_CodeSniffer\Autoload::load() /var/www/sitename/vendor/squizlabs/php_codesniffer/bin/phpcs:17                                                                                           
  PHP   4. include() /var/www/sitename/vendor/squizlabs/php_codesniffer/autoload.php:79                                                                                                               
  PHP Fatal error:  require_once(): Failed opening required '/var/www/sitename/vendor/composer/autoload_real.php' (include_path='.:/usr/share/php') in /var/www/sitename/vendor/autoload.php on line 5  
  PHP Stack trace:                                                                                                                                                                                  
  PHP   1. {main}() /var/www/sitename/vendor/squizlabs/php_codesniffer/bin/phpcs:0                                                                                                                    
  PHP   2. spl_autoload_call() /var/www/sitename/vendor/squizlabs/php_codesniffer/bin/phpcs:17                                                                                                        
  PHP   3. PHP_CodeSniffer\Autoload::load() /var/www/sitename/vendor/squizlabs/php_codesniffer/bin/phpcs:17                                                                                           
  PHP   4. include() /var/www/sitename/vendor/squizlabs/php_codesniffer/autoload.php:79  

[gsherwood]

You've also reported this here: PHPCSStandards/composer-installer#53

I'm going to close this report as it's best for the project you are installing to have a look at what is going on. If you can't install PHPCS directly via composer, then I'd take a look. But given I have no idea what that phpcodesniffer-composer-installer plugin is doing, it's best for them to take a look first and let me know if they need changes from PHPCS.

[BonBonSlick]

Yeah, a lot of dependencies, i do not where problem is, so reported to every package.