Atualize /etc/default/grub
e defina:
GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"
execute update-grub && reboot
Em vez de docker info
(que parece estar com bugs), use lxc-checkconfig
ou check-config.sh do repositório do Docker (moby):
wget https://raw.githubusercontent.com/moby/moby/master/contrib/check-config.sh && bash check-config.sh