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Check if Ubuntu Linux Kernel version is 4.9
$ uname -r
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If not, follow the link http://www.yourownlinux.com/2016/12/how-to-install-linux-kernel-4-9-0-in-linux.html instructions to update your Ubuntu Linux Kernel to 4.9
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Check again the kernel version, make sure again kernel version is 4.9
$ uname -r
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Then confirm the bbr modules is included...
$ ls -a /lib/modules/$(uname -r)/kernel/net/ipv4 | grep bbr tcp_bbr.ko
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Grep to see the congestion control currently using in Ubuntu, for me, my default is using cubic
$ cat /proc/sys/net/ipv4/tcp_congestion_control cubic
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Change the setting of tcp_congestion_control by echo, i did that in root
$ sudo -i $ echo "bbr" > /proc/sys/net/ipv4/tcp_congestion_control $ cat /proc/sys/net/ipv4/tcp_congestion_control bbr
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You are now using bbr congestion control
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Ubuntu using BBR
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