# Pastebin 94UW6xgd
root@purgatory:~# cgroupfs-umount 
mountpoint: invalid option -- '.'
Try 'mountpoint --help' for more information.
rmdir: invalid option -- '.'
Try 'rmdir --help' for more information.
rmdir: failed to remove 'init.scope': Device or resource busy
rmdir: failed to remove 'system.slice': Device or resource busy
rmdir: failed to remove 'user.slice': Device or resource busy
root@purgatory:~# cgroupfs-mount
mount: /sys/fs/cgroup/cpuset: cgroup already mounted or mount point busy.
mount: /sys/fs/cgroup/cpu: cgroup already mounted or mount point busy.
mount: /sys/fs/cgroup/blkio: cgroup already mounted on /sys/fs/cgroup/cpuacct.
mount: /sys/fs/cgroup/memory: cgroup already mounted on /sys/fs/cgroup/cpuacct.
mount: /sys/fs/cgroup/pids: cgroup already mounted on /sys/fs/cgroup/cpuacct.
root@purgatory:~# systemctl start docker.service
root@purgatory:~#