Composer user on Ubuntu -

trying composer update throw exception on laravel :

[runtimeexception]
not delete /home/sherkat2017/ftp/www/vendor/symfony/yaml/dumper.php:

even running chmod 775 -r vendor , chown sher:www-data -r vendor did not solve issue:

drwxrwxr-x  8 sher www-data        4096 apr 13 18:25 storage 

i think composer run user different www-data .

this worked me

• delete /vendor folder
• delete composer.lock
• run composer install

and run these commands while re-install

• composer install --no-dev --no-scripts
• composer install --no-dev -o
• composer install