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is Present
Your server is , you must install Apache
PHP is Present
Your PHP version is , you must install PHP 5.6.x or greater
Mod Rewrite module is Present
Mod Rewrite is not enabled
In order to use mod_rewrite you can type the following command in the terminal:
a2enmod rewrite

Restart apache2 after
/etc/init.d/apache2 restart
Your videos directory is writable
Your videos directory must be writable
The video directory does not exists, YouPHPTube had no permition to create it, you must create it manualy! 
sudo mkdir

Then you can set the permissions. 
sudo chmod -R 777
Your post_max_size is
Your post_max_size is , it must be at least 100M
Edit the php.ini file 
sudo nano
Your upload_max_filesize is
Your upload_max_filesize is , it must be at least 100M
Edit the php.ini file 
sudo nano