Zimbra Forums

Installing extra packages (4):
zimbra-drive
zimbra-patch
zimbra-proxy-patch
zimbra-chat
...done

Running Post Installation Configuration:
Operations logged to /tmp/zmsetup.20190515-160938.log
Setting defaults.../opt/zimbra/bin/zmjava: line 59: /opt/zimbra/common/lib/jvm/java/bin/java: No such file or directory
/opt/zimbra/bin/zmjava: line 59: /opt/zimbra/common/lib/jvm/java/bin/java: No such file or directory
/opt/zimbra/bin/zmjava: line 59: /opt/zimbra/common/lib/jvm/java/bin/java: No such file or directory
/opt/zimbra/bin/zmjava: line 59: /opt/zimbra/common/lib/jvm/java/bin/java: No such file or directory
/opt/zimbra/bin/zmjava: line 59: /opt/zimbra/common/lib/jvm/java/bin/java: No such file or directory
done.
Checking for port conflicts
Port conflict detected: 25 (zimbra-mta)
Port conflicts detected! - Press Enter/Return key to continue

That output indicates that you have another mail server running on your system, you need to stop that and disable it from starting then run the install of ZCS again.