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sudo apt install linux-generic-hwe-16.04

sudo nano /etc/sysctl.conf

Then copy and paste the following into it:

net.core.default_qdisc = fq
net.core.netdev_max_backlog = 10000
net.core.optmem_max = 40960
net.core.somaxconn = 1024
net.core.rmem_default = 33554432
net.core.wmem_default = 33554432
net.core.rmem_max = 33554432
net.core.wmem_max = 33554432
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.tcp_wmem = 4096 65536 33554432
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_fastopen = 1
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_max_tw_buckets = 1048576
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_tw_reuse = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv6.conf.all.disable_ipv6 = 1
vm.swappiness = 1

Save it then:  sudo reboot