Finally installed ansible-lint and fixed all lint errors.

    - ansible_distribution == 'Ubuntu'

- name: Read /proc/cmdline to check for cgroups already running

  shell: cat /proc/cmdline

  register: cmdline

  slurp:

    src: /proc/cmdline

  register: slurped_cmdline

  when:

    - ansible_distribution == 'Ubuntu'

- name: Reboot to enable cgroups if not already running

- name: Decode slurped command line

  set_fact:

    cmdline: "{{ slurped_cmdline.content | b64decode }}"

  when:

    - ansible_distribution == 'Ubuntu'

- name: Reboot to enable cgroups if not already enabled

  reboot:

  when:

    - ansible_distribution == 'Ubuntu'

    - '"cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory" not in cmdline.stdout'

    - '"cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory" not in cmdline'