Install br2684ctl by entering the following commands in the terminal:
sudo apt update sudo apt install br2684ctl
Utility for configuring RFC 2684 ATM/Ethernet bridging
ATM bridging is a way to extend Ethernet over an ATM network and is mainly used for DSL connections. This package contains the user space utility needed to configure the kernel driver. . This package is needed if you own an USB DSL modem and your connection uses one of these protocols: RFC 1483 bridged (RFC 2684 bridged), RFC 1483 bridged (RFC 2684 routed), PPP over Ethernet (PPPoE).