In case anyone has the same problem here is the solution.

On a fresh and basic Ubuntu 18.04.1 install you need to add the universe repository:
sudo add-apt-repository universe

Any help on this? I can't be the only one having this issue since it's a fresh and basic Ubuntu 18.04 install

deb http://repos.zend.com/zend-server/2018.0/deb_ssl1.1 server non-free

I just tried installing ZS 2018 on a fresh Ubuntu 18.04 and i got the following error: The following packages have unmet dependencies: zend-server-php-7.2-common : Depends: php-7.2-common-extensions-zend-server (>= 9.2.0) but it is not going to be installed Depends: php-7.2-extra-extensions-zend-ser...

thanks

After upgrading to Zend Server 2018 getting a lot of log messages on every PHP command. Can this be turned off? [06.07.2018 13:15:15.917 p17761/t139912636012352 DBG1] Logs directory is set to: /usr/local/zend/var/log [06.07.2018 13:15:15.917 p17761/t139912636012352 DBG1] install directory is set to:...

According the system requirements Zend Server 2018 is not supported on Ubuntu LTS 18.04. When will this be supported?