ubuntu-core-launcher ERROR: Error upgrading parity data: CannotLockVersionFile
2016-04-14T00:09:40.684240Z systemd parity_parity_1.1.0.service: main process exited, code=exited, status=1/FAILURE
2016-04-14T00:09:40.685787Z systemd Unit parity_parity_1.1.0.service entered failed state.
2016-04-14T00:09:40.691637Z systemd parity_parity_1.1.0.service failed.
2016-04-14T00:09:40.837016Z systemd parity_parity_1.1.0.service holdoff time over, scheduling restart.
2016-04-14T00:09:40.840271Z systemd start request repeated too quickly for parity_parity_1.1.0.service
2016-04-14T00:09:40.841670Z systemd Failed to start Parity Ethereum client.

(RaspberryPi2)ubuntu@localhost:~$ sudo service parity_parity_1.1.0 status
● parity_parity_1.1.0.service - Parity Ethereum client
   Loaded: loaded (/etc/systemd/system/parity_parity_1.1.0.service; enabled; vendor preset: enabled)
   Active: failed (Result: start-limit) since Thu 2016-04-14 00:09:40 UTC; 12min ago
  Process: 1943 ExecStart=/usr/bin/ubuntu-core-launcher parity.ethcore parity.ethcore_parity_1.1.0 /apps/parity.ethcore/1.1.0/parity (code=exited, status=1/FAILURE)
 Main PID: 1943 (code=exited, status=1/FAILURE)

Apr 14 00:09:40 localhost.localdomain systemd[1]: parity_parity_1.1.0.service: main process exited, code=exited, status=1/FAILURE
Apr 14 00:09:40 localhost.localdomain systemd[1]: Unit parity_parity_1.1.0.service entered failed state.
Apr 14 00:09:40 localhost.localdomain systemd[1]: parity_parity_1.1.0.service failed.
Apr 14 00:09:40 localhost.localdomain systemd[1]: parity_parity_1.1.0.service holdoff time over, scheduling restart.
Apr 14 00:09:40 localhost.localdomain systemd[1]: start request repeated too quickly for parity_parity_1.1.0.service
Apr 14 00:09:40 localhost.localdomain systemd[1]: Failed to start Parity Ethereum client.
Apr 14 00:09:40 localhost.localdomain systemd[1]: Unit parity_parity_1.1.0.service entered failed state.
Apr 14 00:09:40 localhost.localdomain systemd[1]: parity_parity_1.1.0.service failed.