Não consigo importar o matplotlib no jupyter

Não sei se me falta configurar algo no ambiente do jupyter pelo anaconda, mas quando insiro o comando:

%matplotlib inline
import matplotlib.pyplot as plt
plt.rc('figure', figsize = (20,10))

Me é reportado o seguinte erro:

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-48-f13cbf4f08a5> in <module>
----> 1 get_ipython().run_line_magic('matplotlib', 'inline')
      2 import matplotlib.pyplot as plt
      3 plt.rc('figure', figsize = (20,10))

~\anaconda3\envs\alura_pandas\lib\site-packages\IPython\core\interactiveshell.py in run_line_magic(self, magic_name, line, _stack_depth)
   2324                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2325             with self.builtin_trap:
-> 2326                 result = fn(*args, **kwargs)
   2327             return result
   2328 

~\anaconda3\envs\alura_pandas\lib\site-packages\decorator.py in fun(*args, **kw)
    230             if not kwsyntax:
    231                 args, kw = fix(args, kw, sig)
--> 232             return caller(func, *(extras + args), **kw)
    233     fun.__name__ = func.__name__
    234     fun.__doc__ = func.__doc__

~\anaconda3\envs\alura_pandas\lib\site-packages\IPython\core\magic.py in <lambda>(f, *a, **k)
    185     # but it's overkill for just that one bit of state.
    186     def magic_deco(arg):
--> 187         call = lambda f, *a, **k: f(*a, **k)
    188 
    189         if callable(arg):

~\anaconda3\envs\alura_pandas\lib\site-packages\IPython\core\magics\pylab.py in matplotlib(self, line)
     97             print("Available matplotlib backends: %s" % backends_list)
     98         else:
---> 99             gui, backend = self.shell.enable_matplotlib(args.gui.lower() if isinstance(args.gui, str) else args.gui)
    100             self._show_matplotlib_backend(args.gui, backend)
    101 

~\anaconda3\envs\alura_pandas\lib\site-packages\IPython\core\interactiveshell.py in enable_matplotlib(self, gui)
   3417         """
   3418         from IPython.core import pylabtools as pt
-> 3419         gui, backend = pt.find_gui_and_backend(gui, self.pylab_gui_select)
   3420 
   3421         if gui != 'inline':

~\anaconda3\envs\alura_pandas\lib\site-packages\IPython\core\pylabtools.py in find_gui_and_backend(gui, gui_select)
    278     """
    279 
--> 280     import matplotlib
    281 
    282     if gui and gui != 'auto':

ModuleNotFoundError: No module named 'matplotlib'

Alguém sabe me dizer se faltou, ou mudou algo, no Import da biblioteca do Matplotlib?