I find installing Debian via VNC a time consuming process. Luckily there is an option to install Debian "unattended". You can do so using a preseed file to feed the selections and able to include advanced script customizations. If you come from CentOs World, then think of it as a kickstart file.
This is not new information, I just wanted the wonderful LES community to be aware of this great time saver.
The official source is at https://wiki.debian.org/DebianInstaller/Preseed and a long fi...
UFW & Iptables not working in Debian 10
If you are getting an iptables related issue generally or when trying to use an OpenVPN installer script or general VPN setup and the error is similar to:
iptables-restore v1.8.4 (legacy): couldn't load match `limit':no such file or directory
iptables v1.8.2 (nf_tables): unknown option "--dport"
iptables v1.8.4 (nf_tables): unknown option "--dport"
error: couldn't determine iptables version