Configuring OpenSSH fails, Starting Web GUI fails after upgrade to 18.1.2

[DoubleJ]

You may ignore the message below, since I decided to do a clean install. As stated in the message below it was running already for a long time. A clean install wouldn't hurt.

Dear All,

I've installed opnsense on a VM in the cloud by using the opnsense-bootstrap.sh script for over years now. Never had trouble with it until now. I wanted to upgrade to 18.1. During the upgrade process encountered problems with upgrading the kernel.  So in the end I decided to run the latest opnsense-bootstrap.sh script to set everything right. The upgrade process ended without any problems/errors, but now when booting I get to the console, but get errors:
Configuring OpenSSH .....failed
Starting Web GUI ..... failed
/usr/local/lib/libssl.so.44: Undefined symbol "timingsafe_memcmp"

When I go into the shell and try to start lighttpd manually it gives me the error:
/usr/local/sbin/lighttpd: Undefined symbol "memset_s"

The VM is used as endpoint of a VPN. On the other router I can also see that the VPN is not able to connect to the VM, so probably more services are not starting.

How to move on in troubleshooting these problems? any suggestions are very much appreciated....
Thanks in advance,
JJ