title: Unable to start Docker Service in Ubuntu 16.04
body: <p>I've been trying to use <strong>Docker (1.10) on Ubuntu 16.04</strong> but installation fails because <strong>Docker Service doesn't start</strong>.
  I've already tried to install docker by <em>docker.io</em>, <em>docker-engine</em> apt packages and <code>curl -sSL https://get.docker.com/ | sh</code> but it doesn't work.</p>
  
  <p>My <strong>Host info</strong> is:</p>
  
  <p><code>Linux Xenial 4.5.3-040503-generic #201605041831 SMP Wed May 4 22:33:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux</code></p>
  
  <p>Here is <strong><code>systemctl status docker.service</code></strong>:</p>
  
  <pre><code>● docker.service - Docker Application Container Engine
     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since sáb 2016-05-14 15:17:31 CEST; 12min ago
       Docs: https://docs.docker.com
    Process: 22479 ExecStart=/usr/bin/docker daemon -H fd:// (code=exited, status=1/FAILURE)
   Main PID: 22479 (code=exited, status=1/FAILURE)
  
  may 14 15:17:30 Xenial docker[22479]: time="2016-05-14T15:17:30.103601523+02:00" level=info msg="New containerd process, pid: 22485\n"
  may 14 15:17:31 Xenial docker[22479]: time="2016-05-14T15:17:31.149064723+02:00" level=error msg="devmapper: Unable to delete device: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool"
  may 14 15:17:31 Xenial docker[22479]: time="2016-05-14T15:17:31.149127439+02:00" level=warning msg="devmapper: Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section."
  may 14 15:17:31 Xenial docker[22479]: time="2016-05-14T15:17:31.153010028+02:00" level=error msg="[graphdriver] prior storage driver \"devicemapper\" failed: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool"
  may 14 15:17:31 Xenial docker[22479]: time="2016-05-14T15:17:31.153130839+02:00" level=fatal msg="Error starting daemon: error initializing graphdriver: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool"
  may 14 15:17:31 Xenial systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
  may 14 15:17:31 Xenial docker[22479]: time="2016-05-14T15:17:31+02:00" level=info msg="stopping containerd after receiving terminated"
  may 14 15:17:31 Xenial systemd[1]: Failed to start Docker Application Container Engine.
  may 14 15:17:31 Xenial systemd[1]: docker.service: Unit entered failed state.
  may 14 15:17:31 Xenial systemd[1]: docker.service: Failed with result 'exit-code'.
  </code></pre>
  
  <p>Here is <strong><code>sudo docker daemon -D</code></strong></p>
  
  <pre><code>DEBU[0000] docker group found. gid: 999                 
  DEBU[0000] Listener created for HTTP on unix (/var/run/docker.sock) 
  INFO[0000] previous instance of containerd still alive (23050) 
  DEBU[0000] containerd connection state change: CONNECTING 
  DEBU[0000] Using default logging driver json-file       
  DEBU[0000] Golang's threads limit set to 55980          
  DEBU[0000] received past containerd event: &amp;types.Event{Type:"live", Id:"", Status:0x0, Pid:"", Timestamp:0x57372cae} 
  DEBU[0000] containerd connection state change: READY    
  DEBU[0000] devicemapper: driver version is 4.34.0       
  DEBU[0000] devmapper: Generated prefix: docker-8:6-2101297 
  DEBU[0000] devmapper: Checking for existence of the pool docker-8:6-2101297-pool 
  DEBU[0000] devmapper: poolDataMajMin=7:0 poolMetaMajMin=7:1
  
  DEBU[0000] devmapper: Major:Minor for device: /dev/loop0 is:7:0 
  DEBU[0000] devmapper: Major:Minor for device: /dev/loop1 is:7:1 
  DEBU[0000] devmapper: loadDeviceFilesOnStart()          
  DEBU[0000] devmapper: Skipping file /var/lib/docker/devicemapper/metadata/transaction-metadata 
  DEBU[0000] devmapper: loadDeviceFilesOnStart() END      
  DEBU[0000] devmapper: constructDeviceIDMap()            
  DEBU[0000] devmapper: constructDeviceIDMap() END        
  DEBU[0000] devmapper: Rolling back open transaction: TransactionID=1 hash= device_id=1 
  ERRO[0000] devmapper: Unable to delete device: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool 
  WARN[0000] devmapper: Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section. 
  DEBU[0000] devmapper: Initializing base device-mapper thin volume 
  DEBU[0000] devicemapper: CreateDevice(poolName=/dev/mapper/docker-8:6-2101297-pool, deviceID=1) 
  DEBU[0000] devmapper: Error creating device: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool 
  DEBU[0000] devmapper: Error device setupBaseImage: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool 
  ERRO[0000] [graphdriver] prior storage driver "devicemapper" failed: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool 
  DEBU[0000] Cleaning up old mountid : start.             
  FATA[0000] Error starting daemon: error initializing graphdriver: devicemapper: Can't set task name /dev/mapper/docker-8:6-2101297-pool
  </code></pre>
  
  <p>Here is <strong><a href="https://github.com/docker/docker/blob/master/contrib/check-config.sh">./check-config.sh</a></strong> output:</p>
  
  <pre><code>warning: /proc/config.gz does not exist, searching other paths for kernel config ...
  info: reading kernel config from /boot/config-4.5.3-040503-generic ...
  
  Generally Necessary:
  - cgroup hierarchy: properly mounted [/sys/fs/cgroup]
  - apparmor: enabled and tools installed
  - CONFIG_NAMESPACES: enabled
  - CONFIG_NET_NS: enabled
  - CONFIG_PID_NS: enabled
  - CONFIG_IPC_NS: enabled
  - CONFIG_UTS_NS: enabled
  - CONFIG_DEVPTS_MULTIPLE_INSTANCES: enabled
  - CONFIG_CGROUPS: enabled
  - CONFIG_CGROUP_CPUACCT: enabled
  - CONFIG_CGROUP_DEVICE: enabled
  - CONFIG_CGROUP_FREEZER: enabled
  - CONFIG_CGROUP_SCHED: enabled
  - CONFIG_CPUSETS: enabled
  - CONFIG_MEMCG: enabled
  - CONFIG_KEYS: enabled
  - CONFIG_MACVLAN: enabled (as module)
  - CONFIG_VETH: enabled (as module)
  - CONFIG_BRIDGE: enabled (as module)
  - CONFIG_BRIDGE_NETFILTER: enabled (as module)
  - CONFIG_NF_NAT_IPV4: enabled (as module)
  - CONFIG_IP_NF_FILTER: enabled (as module)
  - CONFIG_IP_NF_TARGET_MASQUERADE: enabled (as module)
  - CONFIG_NETFILTER_XT_MATCH_ADDRTYPE: enabled (as module)
  - CONFIG_NETFILTER_XT_MATCH_CONNTRACK: enabled (as module)
  - CONFIG_NF_NAT: enabled (as module)
  - CONFIG_NF_NAT_NEEDED: enabled
  - CONFIG_POSIX_MQUEUE: enabled
  
  Optional Features:
  - CONFIG_USER_NS: enabled
  - CONFIG_SECCOMP: enabled
  - CONFIG_CGROUP_PIDS: enabled
  - CONFIG_MEMCG_KMEM: missing
  - CONFIG_MEMCG_SWAP: enabled
  - CONFIG_MEMCG_SWAP_ENABLED: missing
      (note that cgroup swap accounting is not enabled in your kernel config, you can enable it by setting boot option "swapaccount=1")
  - CONFIG_BLK_CGROUP: enabled
  - CONFIG_BLK_DEV_THROTTLING: enabled
  - CONFIG_IOSCHED_CFQ: enabled
  - CONFIG_CFQ_GROUP_IOSCHED: enabled
  - CONFIG_CGROUP_PERF: enabled
  - CONFIG_CGROUP_HUGETLB: enabled
  - CONFIG_NET_CLS_CGROUP: enabled (as module)
  - CONFIG_CGROUP_NET_PRIO: enabled
  - CONFIG_CFS_BANDWIDTH: enabled
  - CONFIG_FAIR_GROUP_SCHED: enabled
  - CONFIG_RT_GROUP_SCHED: missing
  - CONFIG_EXT3_FS: missing
  - CONFIG_EXT3_FS_XATTR: missing
  - CONFIG_EXT3_FS_POSIX_ACL: missing
  - CONFIG_EXT3_FS_SECURITY: missing
      (enable these ext3 configs if you are using ext3 as backing filesystem)
  - CONFIG_EXT4_FS: enabled
  - CONFIG_EXT4_FS_POSIX_ACL: enabled
  - CONFIG_EXT4_FS_SECURITY: enabled
  - Network Drivers:
    - "overlay":
      - CONFIG_VXLAN: enabled (as module)
  - Storage Drivers:
    - "aufs":
      - CONFIG_AUFS_FS: missing
    - "btrfs":
      - CONFIG_BTRFS_FS: enabled (as module)
    - "devicemapper":
      - CONFIG_BLK_DEV_DM: enabled
      - CONFIG_DM_THIN_PROVISIONING: enabled (as module)
    - "overlay":
      - CONFIG_OVERLAY_FS: enabled (as module)
    - "zfs":
      - /dev/zfs: missing
      - zfs command: missing
      - zpool command: missing
  </code></pre>
  
  <p>If someone could please help me I would be very thankful</p>