Issue installing APM under Ubuntu Server 16.04

Issue installing APM under Ubuntu Server 16.04

Hi,
I'm having a hard time installing the APM plugin (taken from https://www.manageengine.com/network-monitoring/29809517/ManageEngine_OpManager_APM_PlugIn_64bit.bin) in a brand new Ubuntu Server 16.04.
I previously installed OpManager Essentials (from https://www.manageengine.com/network-monitoring/29809517/ManageEngine_OpManager_64bit.bin) in /opt/ManageEngine/OpManager - the daemon starts up correctly.
I'm giving the desired installation path "/opt/ManageEngine/AppManager" to the binary installer, and I supply the correct OpManager path "/opt/ManageEngine/OpManager", but the installer fails to find the OpManager installation and keeps asking for the correct root path.
From the validation script the installer created in /opt/ManageEngine/AppManager/validation_check.sh I guess that it looks for an About.properties, so I tried supplying different OpManager paths like "/opt/ManageEngine/OpManager/bin" or "/opt/ManageEngine/OpManager/html/" without luck.
Can you help?
Thanks,

Marco
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