在Ubuntu上安装jupyter笔记本时，如何解决以下错误：
$pip3 install jupyter
错误
AttributeError: _DistInfoDistribution__dep_map ValueError: ('Expected version spec in', 'widgetsnbextension ~=3.5.0', 'at', ' ~=3.5.0') pratikubuntu@ubuntu-inspiron-3541:~$ pip3 install jupyter
Downloading/unpacking jupyter
Downloading jupyter-1.0.0-py2.py3-none-any.whl
Downloading/unpacking qtconsole (from jupyter)
Downloading qtconsole-4.6.0-py2.py3-none-any.whl (121kB): 121kB downloaded
Downloading/unpacking ipywidgets (from jupyter)
Downloading ipywidgets-7.5.1-py2.py3-none-any.whl (121kB): 121kB downloaded
Cleaning up...
Exception:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2482, in _dep_map
return self.__dep_map
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2344, in __getattr__
raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 278, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "/usr/lib/python3/dist-packages/pip/req.py", line 1266, in prepare_files
req_to_install.extras):
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2291, in requires
dm = self._dep_map
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2484, in _dep_map
self.__dep_map = self._compute_dependencies()
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2508, in _compute_dependencies
parsed = next(parse_requirements(distvers))
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2605, in parse_requirements
line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2573, in scan_list
raise ValueError("Expected "+item_name+" in",line,"at",line[p:])
ValueError: ('Expected version spec in', 'widgetsnbextension ~=3.5.0', 'at', ' ~=3.5.0')
Storing debug log for failure in /home/pratikubuntu/.pip/pip.log