Hello Simon,
I have even tried to deploy the latest version which is 7.6 and received above same error. Please find further log files below.
Feb 18 05:47:10 kernel: device vethc252243 entered promiscuous mode
Feb 18 05:47:10 kernel: IPv6: ADDRCONF(NETDEV_UP): vethc252243: link is not ready
Feb 18 05:47:10 kernel: br-c5158bd71578: port 1(vethc252243) entered blocking state
Feb 18 05:47:10 kernel: br-c5158bd71578: port 1(vethc252243) entered forwarding state
Feb 18 05:47:10 NetworkManager[535]: [1550468830.9255] manager: (veth5c09d0a): new Veth device (/org/freedesktop/NetworkManager/Devices/68)
Feb 18 05:47:10 NetworkManager[535]: [1550468830.9295] manager: (vethc252243): new Veth device (/org/freedesktop/NetworkManager/Devices/69)
Feb 18 05:47:11 containerd: time=“2019-02-18T05:47:11.014555585Z” level=info msg=“shim containerd-shim started” address="/containerd-shim/moby/bea3b29b3ed5ec301511172506cae7bd11123d2c65ffddc1349af182e2de6b75/shim.sock" debug=false pid=5491
Feb 18 05:47:11 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): vethc252243: link becomes ready
Feb 18 05:47:11 NetworkManager[535]: [1550468831.3373] device (vethc252243): carrier: link connected
Feb 18 05:47:11 NetworkManager[535]: [1550468831.3376] device (br-c5158bd71578): carrier: link connected
Feb 18 05:47:27 containerd: time=“2019-02-18T05:47:27.150948007Z” level=info msg=“shim reaped” id=bea3b29b3ed5ec301511172506cae7bd11123d2c65ffddc1349af182e2de6b75
Feb 18 05:47:27 dockerd: time=“2019-02-18T05:47:27.160938703Z” level=info msg=“ignoring event” module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Feb 18 05:47:27 kernel: br-c5158bd71578: port 1(vethc252243) entered disabled state
Feb 18 05:47:27 NetworkManager[535]: [1550468847.2414] manager: (veth5c09d0a): new Veth device (/org/freedesktop/NetworkManager/Devices/70)
Feb 18 05:47:27 kernel: br-c5158bd71578: port 1(vethc252243) entered disabled state
Feb 18 05:47:27 kernel: device vethc252243 left promiscuous mode
Feb 18 05:47:27 kernel: br-c5158bd71578: port 1(vethc252243) entered disabled state
Feb 18 05:47:27 NetworkManager[535]: [1550468847.3575] device (vethc252243): released from master device br-c5158bd71578
Feb 18 05:47:27 kernel: br-c5158bd71578: port 1(veth1ed957d) entered blocking state
Feb 18 05:47:27 kernel: br-c5158bd71578: port 1(veth1ed957d) entered disabled state