Instalacja środowiska graficznego Xfce oraz klienta VPN w systemie Debian 11 Netinstall

sudo apt install task-xfce-desktop
sudo systemctl get-default
apt install mc xrdp strongswan xl2tpd ssh 
apt install network-manager network-manager-strongswan network-manager-l2tp network-manager-l2tp-gnome
apt install network-manager-openconnect-gnome 
apt install wget

Źródła:
https://unix.stackexchange.com/questions/620448/l2tp-ipsec-vpn-on-debian-10-without-network-manager

http://kl.letowice.pl/konfiguracja-klienta-vpn-l2tpipsec-na-raspberry-pi-z-raspbianemdebian/

https://www.tecmint.com/setup-ipsec-vpn-with-strongswan-on-debian-ubuntu/

https://unam.re/blog/setup-vpn-ipsec-in-debian