Cacher is the code snippet organizer for pro developers

# Recommendation from Wordpress 
# 
# Set all diretories without touching files
 
sudo find /var/www -type d -exec chmod 755 {} + 
 
# Set all files without touching directories
 
sudo find /var/www -type f -exec chmod 644 {} + 
 
# and then set the owner and group as www-data:
 
sudo chown -R www-data:www-data /var/www/your_wordpres_folder
 
# When you use SSH to upload files, or install
# plugins, those files are set as owned by the 
# user you are logged in with SSH, so that could 
# be what was causing the issue.