ADE: Did not find BEK volume to store passphrase in

A customer is having the follow error on a marketplace Ubuntu VM (**Canonical:UbuntuServer:16.04-LTS:latest**) with a data disk.

**AzureDiskEncryptionForLinux** version is **1.1.0.17**

```
2018/10/03 20:49:52 [Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.0]: 13940: [Error] Failed to enable the extension with error: Did not find BEK volume to store passphrase in, stack trace
: Traceback (most recent call last):
2018/10/03 20:49:52 File "/var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.17/main/handle.py", line 695, in enable_encryption
2018/10/03 20:49:52 bek_util.store_bek_passphrase(encryption_config, extension_parameter.passphrase)
2018/10/03 20:49:52 File "/var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.17/main/BekUtil.py", line 76, in store_bek_passphrase
2018/10/03 20:49:52 raise Exception("Did not find BEK volume to store passphrase in")
2018/10/03 20:49:52 Exception: Did not find BEK volume to store passphrase in
2018/10/03 20:49:52
2018/10/03 20:49:52 [Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.0]: [StatusReport (0)] op: EnableEncryption
2018/10/03 20:49:52 [Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.0]: [StatusReport (0)] status: error
2018/10/03 20:49:52 [Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.0]: [StatusReport (0)] code: 100
2018/10/03 20:49:52 [Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.0]: [StatusReport (0)] msg: Failed to enable the extension with error: Did not find BEK volume to store passphrase in, st
ack trace: Traceback (most recent call last):
2018/10/03 20:49:52 File "/var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.17/main/handle.py", line 695, in enable_encryption
2018/10/03 20:49:52 bek_util.store_bek_passphrase(encryption_config, extension_parameter.passphrase)
2018/10/03 20:49:52 File "/var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.17/main/BekUtil.py", line 76, in store_bek_passphrase
2018/10/03 20:49:52 raise Exception("Did not find BEK volume to store passphrase in")
2018/10/03 20:49:52 Exception: Did not find BEK volume to store passphrase in
2018/10/03 20:49:52
```