Unfortunately. I could get it working. Already, tried Mint + Raspbian and Mint standalong. It is always Watchdog_expired after one minute and there is no any coins after one day. When I start sentinel from compiled the test gives error: 'No module named builtins'.
The debug gives:
Traceback (most recent call last):
  File "bin/sentinel.py", line 5, in
    import init
  File "lib/init.py", line 1, in
    from builtins import input
ImportError: No module named builtins

I checked this files and did not find this module "builtins". What am I missing? I do not know Pyton.
The built version gives error:

-342: non-JSON HTTP response with '401 Unauthorized' from server
Cannot connect to desired. Please ensure desired is running and the JSONRPC port is open to Sentinel.

PS: I have rpcuser=user and rpcpassword=pass in desire.conf