Docker use aufs storage driver provided by linux-image-extra-*

If you use the mainline kernel from PPA. The apt install may get stuck.

A workaround is overwrite the systemd configuration to use overlay for docker service:

Create /etc/systemd/system/docker.service.d/overlay.conf :

[Service]
ExecStart=
ExecStart=/usr/bin/docker daemon -H fd:// -s overlay
#Flush systemd setting:
	
sudo systemctl daemon-reload

#verify that the configuration has been loaded:
	
systemctl show --property=ExecStart docker

#restart docker:
	
sudo systemctl restart docker