Instructions for enabling the memory cgroup on Ubuntu 18 and 19 involve adding cgroup_enable=cpuset cgroup_enable=memory cgroup_memory=1 to /boot/firmware/nobtcmd.txt and restarting. After rebooting, grep mem /proc/cgroups should show it as enabled.
I find that on Ubuntu 20.04 the above instructions are not working for me, and Kubernetes continues to error [ERROR SystemVerification]: missing cgroups: memory. Any suggestions?