Problem installing pytorch xubuntu

Hi,
I get some errors while installation of pytorch,
could you please tell me what is going wrong here?

pip install --upgrade --force-reinstall torchvision
Collecting torchvision
Using cached https://files.pythonhosted.org/packages/ca/0d/f00b2885711e08bd71242ebe7b96561e6f6d01fdb4b9dcf4d37e2e13c5e1/torchvision-0.2.1-py2.py3-none-any.whl
Collecting six (from torchvision)
Using cached https://files.pythonhosted.org/packages/73/fb/00a976f728d0d1fecfe898238ce23f502a721c0ac0ecfedb80e0d88c64e9/six-1.12.0-py2.py3-none-any.whl
Collecting numpy (from torchvision)
Using cached https://files.pythonhosted.org/packages/e0/b5/63b79fe426433fa1cd110eb04a94ec0c6967e56e5f57c98caf455a5fb6e2/numpy-1.16.1-cp27-cp27mu-manylinux1_x86_64.whl
Collecting torch (from torchvision)
Exception:
Traceback (most recent call last):
File “/usr/lib/python2.7/dist-packages/pip/basecommand.py”, line 215, in main
status = self.run(options, args)
File “/usr/lib/python2.7/dist-packages/pip/commands/install.py”, line 353, in run
wb.build(autobuilding=True)
File “/usr/lib/python2.7/dist-packages/pip/wheel.py”, line 749, in build
self.requirement_set.prepare_files(self.finder)
File “/usr/lib/python2.7/dist-packages/pip/req/req_set.py”, line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File “/usr/lib/python2.7/dist-packages/pip/req/req_set.py”, line 620, in _prepare_file
session=self.session, hashes=hashes)
File “/usr/lib/python2.7/dist-packages/pip/download.py”, line 821, in unpack_url
hashes=hashes
File “/usr/lib/python2.7/dist-packages/pip/download.py”, line 659, in unpack_http_url
hashes)
File “/usr/lib/python2.7/dist-packages/pip/download.py”, line 853, in _download_http_url
stream=True,
File “/usr/share/python-wheels/requests-2.18.4-py2.py3-none-any.whl/requests/sessions.py”, line 521, in get
return self.request(‘GET’, url, **kwargs)
File “/usr/lib/python2.7/dist-packages/pip/download.py”, line 386, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File “/usr/share/python-wheels/requests-2.18.4-py2.py3-none-any.whl/requests/sessions.py”, line 508, in request
resp = self.send(prep, **send_kwargs)
File “/usr/share/python-wheels/requests-2.18.4-py2.py3-none-any.whl/requests/sessions.py”, line 618, in send
r = adapter.send(request, **kwargs)
File “/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/adapter.py”, line 37, in send
cached_response = self.controller.cached_request(request)
File “/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/controller.py”, line 111, in cached_request
resp = self.serializer.loads(request, cache_data)
File “/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/serialize.py”, line 114, in loads
return getattr(self, “_loads_v{0}”.format(ver))(request, data)
File “/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/serialize.py”, line 176, in _loads_v2
cached = json.loads(zlib.decompress(data).decode(“utf8”))
error: Error -3 while decompressing data: too many length or distance symbols

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