manually installed nmap to fix this.
root@syslog:~# apt install nmap
ExecuteOS failed to start command: exec: “nmap”: executable file not found in $PATH
root@syslog:~# uname -a
Linux syslog 4.19.0-13-amd64 #1 SMP Debian 4.19.160-2 (2020-11-28) x86_64 GNU/Linux
root@syslog:~# cat /etc/debian_version
10.7
root@syslog:~# apt-get install siff-collector
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
siff-collector
Andy