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I wouldn't recommend anything from CreeperHost (the apps.modpacks.ch is a domain from CreeperHost), they usually modify their scripts to match their systems. You can download the official server pack from CurseForge here: https://www.curseforge.com/minecraft/modpacks/ftb-infinity-evolved
At the...
Wait, I just saw the file name.
That .sh file was included with the server files? Usually the start script is named ServerStart.sh that provides the following output when you execute the file for the first time:
$ ./ServerStart.sh
Missing required jars. Running install script!
/usr/bin/wget...
The issue is related to the installation of Java in Ubuntu and not to the pack itself. You can install Java separately on Ubuntu through the command line. DigitalOcean has a guide on how to install Java that it's quite complete. Evolved uses Java 8 still so the one you need to install is the...