Comment # 1 on bug 1181887 from Randy Burton

This works correctly on Ubuntu:

root@ubuntu:/var/log > cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.7 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.7 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial
root@ubuntu:/var/log > uname -r
4.15.0-133-generic
root@ubuntu:/var/log > tail /etc/sysctl.conf
#net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
#net.ipv4.conf.all.log_martians = 1
#
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
dev.raid.speed_limit_min = 700000
dev.raid.speed_limit_max = 2000000
root@ubuntu:/var/log > sysctl dev.raid.speed_limit_min
dev.raid.speed_limit_min = 700000
root@ubuntu:/var/log > sysctl dev.raid.speed_limit_max
dev.raid.speed_limit_max = 2000000
root@ubuntu:/var/log >