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I want to try OCR'ing a PDF file, but I fail:

vatolin@ubuntubuk:~$ ocrmypdf -l deu+eng --output-type pdf Schreibtisch/von_SWBau-190510.pdf Schreibtisch/von_SWBau-190510-OCR.pdf
^CProcess ForkPoolWorker-4:
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 108, in worker
    task = get()
  File "/usr/lib/python3.6/multiprocessing/queues.py", line 335, in get
    res = self._reader.recv_bytes()
  File "/usr/lib/python3.6/multiprocessing/connection.py", line 216, in recv_bytes
    buf = self._recv_bytes(maxlength)
  File "/usr/lib/python3.6/multiprocessing/connection.py", line 407, in _recv_bytes
    buf = self._recv(4)
  File "/usr/lib/python3.6/multiprocessing/connection.py", line 379, in _recv
    chunk = read(handle, remaining)
KeyboardInterrupt
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 746, in next
    item = self._items.popleft()
IndexError: pop from an empty deque

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/ruffus/task.py", line 5774, in pipeline_run
    job_result = ii.next(timeout=99999999)
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 750, in next
    self._cond.wait(timeout)
  File "/usr/lib/python3.6/threading.py", line 299, in wait
    gotit = waiter.acquire(True, timeout)
KeyboardInterrupt

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/ocrmypdf/__main__.py", line 864, in run_pipeline
    cmdline.run(options)
  File "/usr/lib/python3/dist-packages/ruffus/cmdline.py", line 824, in run
    **appropriate_options)
  File "/usr/lib/python3/dist-packages/ruffus/task.py", line 5916, in pipeline_run
    raise job_errors
ruffus.ruffus_exceptions.RethrownJobError: 
    
    
    
Original exception:

    Exception #1
      '<class 'KeyboardInterrupt'>' raised in ...
    Traceback (most recent call last):
      File "/usr/lib/python3.6/multiprocessing/pool.py", line 746, in next
        item = self._items.popleft()
    IndexError: pop from an empty deque
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/usr/lib/python3/dist-packages/ruffus/task.py", line 5774, in pipeline_run
        job_result = ii.next(timeout=99999999)
      File "/usr/lib/python3.6/multiprocessing/pool.py", line 750, in next
        self._cond.wait(timeout)
      File "/usr/lib/python3.6/threading.py", line 299, in wait
        gotit = waiter.acquire(True, timeout)
    KeyboardInterrupt
    
    

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/ocrmypdf", line 11, in <module>
    load_entry_point('ocrmypdf==6.1.2', 'console_scripts', 'ocrmypdf')()
  File "/usr/lib/python3/dist-packages/ocrmypdf/__main__.py", line 870, in run_pipeline
    _log.error("Unexpected ruffus exception: " + str(e))
  File "/usr/lib/python3/dist-packages/ruffus/proxy_logger.py", line 289, in error
    return self._callmethod('error', args, kwargs)
  File "/usr/lib/python3.6/multiprocessing/managers.py", line 756, in _callmethod
    conn.send((self._id, methodname, args, kwds))
  File "/usr/lib/python3.6/multiprocessing/connection.py", line 206, in send
    self._send_bytes(_ForkingPickler.dumps(obj))
  File "/usr/lib/python3.6/multiprocessing/connection.py", line 404, in _send_bytes
    self._send(header + buf)
  File "/usr/lib/python3.6/multiprocessing/connection.py", line 368, in _send
    n = write(self._handle, buf)
BrokenPipeError: [Errno 32] Broken pipe

What am I doing wrong?