I just installed 4.16.0 via ARCH AUR and when starting I get the following error:

org.netbeans.InvalidException: StandardModule:org.sleuthkit.autopsy.core jarFile: /usr/share/autopsy/autopsy/modules/org-sleuthkit-autopsy-core.jar: java.lang.UnsatisfiedLinkError: org.sleuthkit.datamodel.SleuthkitJNI.getVersionNat()Ljava/lang/String;

I can disable the modules to get to the GUI, and when I then try to start the Autopsy core manually I get the same message.
What is not linked? Missing a sym link?

My default Java is: java-8-openjdk (default)
I have removed the .autopsy directory as well, but that made no difference.

I would appreciate any help.

The UnsatisfiedLinkError suggests to me that the sleuthkit java bindings have not been built/installed correctly.
I am not familiar with the ARCH AUR. To run Autopsy on Linux I suggest downloading the 4.16.0 zip file from and following the instructions in the included Running_Linux_OSX.txt file.