The lubuntu (at least as that's the one I tried) kernel come with hugepage enabled.
But since allocated hugepages cannot be used otherwise, there's no hugepage allocated by default.
To allocate 512 HugePages (2M each, so that's 1GB reserved to hugepages), as root :
echo 512 > /proc/sys/vm/nr_hugepages
if you want that setup to be kept from boot to boot, setup the /etc/sysctl.conf file accordingly with the vm.nr_hugepages keyword.