Technical Docs Enable TCP BBR on Ubuntu 18.04/20.04 Ubuntu kernels in these versions already support BBR; enable via sysctl: 1 2 3 echo net.core.default_qdisc=fq >> /etc/sysctl.conf echo net.ipv4.tcp_congestion_control=bbr >> /etc/sysctl.conf sysctl -p Verify: 1 2 sysctl net.ipv4.tcp_congestion_control lsmod | grep bbr