need to install apparmor

[white-hat]

got

kernel: [  608.236848] init: docker main process ended, respawning
kernel: [  608.451873] init: docker main process (4230) terminated with status 1
kernel: [  608.451906] init: docker main process ended, respawning
kernel: [  608.676417] init: docker main process (4280) terminated with status 1
kernel: [  608.676445] init: docker respawning too fast, stopped

trying to start docker service,
to fix this, you need to install apparmor at step 3)

$ sudo apt-get install apparmor