Enable tcp_bbr for your debian/ubuntu (tested on debian)

tcp_bbr.sh

#Download 4.9-rc7 kernel
wget kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc7/linux-headers-4.9.0-040900rc7_4.9.0-040900rc7.201611271731_all.deb

wget kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc7/linux-headers-4.9.0-040900rc7-generic_4.9.0-040900rc7.201611271731_amd64.deb

wget kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc7/linux-image-4.9.0-040900rc7-generic_4.9.0-040900rc7.201611271731_amd64.deb

#Install kernel
sudo dpkg -i 'linux-headers-4.9*.deb' 'linux-image-4.9*.deb'

#reboot
sudo reboot

#write config
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf

#apply config
sysctl -p

#set fq to eth
sudo tc qdisc replace dev eth0 root fq pacing

Check current status: cat /boot/config-$(uname -r) | grep BBR

if the result shows "m", it works