I can't install php-zip on my Ubuntu VM with the last php5.6.
Can't find find anything clear on it.
I still get that Apache error :
PHP Fatal error: Class 'ZipArchive' not found in /var/www/uta/system/library/PHPExcel/PHPExcel/Writer/...
sudo apt-get install php-zipor
sudo apt-get install php5.6-zip
Then, you might have to restart your web server.
sudo service apache2 restartor
sudo service nginx restart