Pool - Multiprocessing - [Errno 13] Permission denied - permissions

Question

I'm trying to run a Jupyter Notebook that uses "Pool" From the Multiprocessing package and getting the "[Errno 13] Permission denied" error
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PermissionError Traceback (most recent call last)
<timed exec> in <module>
<ipython-input-9-9d32e1938b9e> in get_ray_tracing(rays, population_element)
7 # Necessario para o windows
8 if __name__ == '__main__':
----> 9 p=Pool(processes = len(rays))
10 # O jupyter notebook necessita que a funcao esteja em um arquivo diference
11 # O programa ficara travado nessa linha ate que todos os processos terminem
/snap/jupyter/6/lib/python3.7/multiprocessing/context.py in Pool(self, processes, initializer, initargs, maxtasksperchild)
117 from .pool import Pool
118 return Pool(processes, initializer, initargs, maxtasksperchild,
--> 119 context=self.get_context())
120
121 def RawValue(self, typecode_or_type, *args):
/snap/jupyter/6/lib/python3.7/multiprocessing/pool.py in __init__(self, processes, initializer, initargs, maxtasksperchild, context)
156 maxtasksperchild=None, context=None):
157 self._ctx = context or get_context()
--> 158 self._setup_queues()
159 self._taskqueue = queue.SimpleQueue()
160 self._cache = {}
/snap/jupyter/6/lib/python3.7/multiprocessing/pool.py in _setup_queues(self)
249
250 def _setup_queues(self):
--> 251 self._inqueue = self._ctx.SimpleQueue()
252 self._outqueue = self._ctx.SimpleQueue()
253 self._quick_put = self._inqueue._writer.send
/snap/jupyter/6/lib/python3.7/multiprocessing/context.py in SimpleQueue(self)
110 '''Returns a queue object'''
111 from .queues import SimpleQueue
--> 112 return SimpleQueue(ctx=self.get_context())
113
114 def Pool(self, processes=None, initializer=None, initargs=(),
/snap/jupyter/6/lib/python3.7/multiprocessing/queues.py in __init__(self, ctx)
330 def __init__(self, *, ctx):
331 self._reader, self._writer = connection.Pipe(duplex=False)
--> 332 self._rlock = ctx.Lock()
333 self._poll = self._reader.poll
334 if sys.platform == 'win32':
/snap/jupyter/6/lib/python3.7/multiprocessing/context.py in Lock(self)
65 '''Returns a non-recursive lock object'''
66 from .synchronize import Lock
---> 67 return Lock(ctx=self.get_context())
68
69 def RLock(self):
/snap/jupyter/6/lib/python3.7/multiprocessing/synchronize.py in __init__(self, ctx)
160
161 def __init__(self, *, ctx):
--> 162 SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
163
164 def __repr__(self):
/snap/jupyter/6/lib/python3.7/multiprocessing/synchronize.py in __init__(self, kind, value, maxvalue, ctx)
57 sl = self._semlock = _multiprocessing.SemLock(
58 kind, value, maxvalue, self._make_name(),
---> 59 unlink_now)
60 except FileExistsError:
61 pass
PermissionError: [Errno 13] Permission denied
I tried, without success, to apply the suggestions of the question Python multiprocessing: Permission denied - Stack Overflow
What else could i try?