JupyterLab Extension install fail

[OliverEvans96]

I ran dev-install.sh as root and received the following error.
I'm on Arch Linux with node.js v7.2.0, and npm 4.0.3

$ sudo ./dev-install.sh
[sudo] password for oliver: 
4.0.3
npm is installed
pip 9.0.1 from /home/oliver/local/miniconda3/lib/python3.5/site-packages (python 3.5)
pip is installed
npm WARN lifecycle jupyter-js-widgets@2.0.11~postinstall: cannot run in wd %s %s (wd=%s) jupyter-js-widgets@2.0.11 npm dedupe /home/oliver/local/src/ipywidgets/jupyter-js-widgets
npm WARN prepublish-on-install As of npm@5, `prepublish` scripts will run only for `npm publish`.
npm WARN prepublish-on-install (In npm@4 and previous versions, it also runs for `npm install`.)
npm WARN prepublish-on-install See the deprecation note in `npm help scripts` for more information.
npm WARN lifecycle jupyter-js-widgets@2.0.11~prepublish: cannot run in wd %s %s (wd=%s) jupyter-js-widgets@2.0.11 npm run build /home/oliver/local/src/ipywidgets/jupyter-js-widgets
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.0.15: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN prepublish-on-install As of npm@5, `prepublish` scripts will run only for `npm publish`.
npm WARN prepublish-on-install (In npm@4 and previous versions, it also runs for `npm install`.)
npm WARN prepublish-on-install See the deprecation note in `npm help scripts` for more information.
npm WARN lifecycle widgetsnbextension@2.0.10~prepublish: cannot run in wd %s %s (wd=%s) widgetsnbextension@2.0.10 npm run build /home/oliver/local/src/ipywidgets/widgetsnbextension
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.0.15: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
Obtaining file:///home/oliver/local/src/ipywidgets/widgetsnbextension
  Running setup.py (path:/home/oliver/local/src/ipywidgets/widgetsnbextension/setup.py) egg_info for package from file:///home/oliver/local/src/ipywidgets/widgetsnbextension
    Running command python setup.py egg_info
    INFO:root:setup.py entered
    INFO:root:$PATH=/home/oliver/local/miniconda3/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/cuda/bin:/usr/lib/jvm/default/bin:/opt/mpich/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
    running egg_info
    writing widgetsnbextension.egg-info/PKG-INFO
    writing dependency_links to widgetsnbextension.egg-info/dependency_links.txt
    writing top-level names to widgetsnbextension.egg-info/top_level.txt
    writing requirements to widgetsnbextension.egg-info/requires.txt
    /home/oliver/local/miniconda3/lib/python3.5/site-packages/setuptools-23.0.0-py3.5.egg/setuptools/dist.py:285: UserWarning: Normalizing '2.0.0.beta6' to '2.0.0b6'
    warning: manifest_maker: standard file '-c' not found

    reading manifest file 'widgetsnbextension.egg-info/SOURCES.txt'
    reading manifest template 'MANIFEST.in'
    writing manifest file 'widgetsnbextension.egg-info/SOURCES.txt'
  Source in /home/oliver/local/src/ipywidgets/widgetsnbextension has version 2.0.0b6, which satisfies requirement widgetsnbextension==2.0.0b6 from file:///home/oliver/local/src/ipywidgets/widgetsnbextension
Requirement already satisfied: notebook>=4.2.0 in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from widgetsnbextension==2.0.0b6)
Requirement already satisfied: jinja2 in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: ipython-genutils in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: ipykernel in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: terminado>=0.3.3; sys_platform != "win32" in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: tornado>=4 in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: jupyter-client in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: nbformat in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: jupyter-core in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: nbconvert in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: traitlets in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: MarkupSafe in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from jinja2->notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: ipython>=4.0.0 in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from ipykernel->notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: pyzmq>=13 in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from jupyter-client->notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: jsonschema!=2.5.0,>=2.4 in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from nbformat->notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: decorator in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from traitlets->notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Requirement already satisfied: six in /home/oliver/local/miniconda3/lib/python3.5/site-packages (from traitlets->notebook>=4.2.0->widgetsnbextension==2.0.0b6)
Installing collected packages: widgetsnbextension
  Found existing installation: widgetsnbextension 2.0.0b6
    Uninstalling widgetsnbextension-2.0.0b6:
      Removing file or directory /home/oliver/local/miniconda3/lib/python3.5/site-packages/widgetsnbextension.egg-link
      Removing pth entries from /home/oliver/local/miniconda3/lib/python3.5/site-packages/easy-install.pth:
      Removing entry: /home/oliver/local/src/ipywidgets/widgetsnbextension
      Successfully uninstalled widgetsnbextension-2.0.0b6
  Running setup.py develop for widgetsnbextension
    Running command /home/oliver/local/miniconda3/bin/python -c "import setuptools, tokenize;__file__='/home/oliver/local/src/ipywidgets/widgetsnbextension/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" develop --no-deps
    INFO:root:setup.py entered
    INFO:root:$PATH=/home/oliver/local/miniconda3/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/cuda/bin:/usr/lib/jvm/default/bin:/opt/mpich/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
    running develop
    running egg_info
    writing top-level names to widgetsnbextension.egg-info/top_level.txt
    writing dependency_links to widgetsnbextension.egg-info/dependency_links.txt
    writing widgetsnbextension.egg-info/PKG-INFO
    writing requirements to widgetsnbextension.egg-info/requires.txt
    /home/oliver/local/miniconda3/lib/python3.5/site-packages/setuptools-23.0.0-py3.5.egg/setuptools/dist.py:285: UserWarning: Normalizing '2.0.0.beta6' to '2.0.0b6'
    warning: manifest_maker: standard file '-c' not found

    reading manifest file 'widgetsnbextension.egg-info/SOURCES.txt'
    reading manifest template 'MANIFEST.in'
    writing manifest file 'widgetsnbextension.egg-info/SOURCES.txt'
    running build_ext
    Creating /home/oliver/local/miniconda3/lib/python3.5/site-packages/widgetsnbextension.egg-link (link to .)
    Adding widgetsnbextension 2.0.0b6 to easy-install.pth file

    Installed /home/oliver/local/src/ipywidgets/widgetsnbextension
Successfully installed widgetsnbextension
Cleaning up...
Installing /home/oliver/local/src/ipywidgets/widgetsnbextension/widgetsnbextension/static -> jupyter-js-widgets
- Validating: OK

    To initialize this nbextension in the browser every time the notebook (or other app) loads:
    
          jupyter nbextension enable widgetsnbextension --py
    
Enabling notebook extension jupyter-js-widgets/extension...
      - Validating: OK
0.11.2
jupyter lab is installed

> jupyter-js-widgets@2.0.11 postinstall /home/oliver/local/src/ipywidgets/jupyterlab_widgets/node_modules/jupyter-js-widgets
> npm dedupe

npm ERR! Linux 4.8.10-1-ARCH
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "dedupe"
npm ERR! node v7.2.0
npm ERR! npm  v4.0.3
npm ERR! path /root/.npm/_locks
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall mkdir

npm ERR! Error: EACCES: permission denied, mkdir '/root/.npm/_locks'
npm ERR!  { Error: EACCES: permission denied, mkdir '/root/.npm/_locks'
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: '/root/.npm/_locks' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/oliver/local/src/ipywidgets/jupyterlab_widgets/node_modules/jupyter-js-widgets/npm-debug.log
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.0.15: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm ERR! Linux 4.8.10-1-ARCH
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install"
npm ERR! node v7.2.0
npm ERR! npm  v4.0.3
npm ERR! code ELIFECYCLE

npm ERR! jupyter-js-widgets@2.0.11 postinstall: `npm dedupe`
npm ERR! Exit status 243
npm ERR! 
npm ERR! Failed at the jupyter-js-widgets@2.0.11 postinstall script 'npm dedupe'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the jupyter-js-widgets package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm dedupe
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs jupyter-js-widgets
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls jupyter-js-widgets
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/oliver/local/src/ipywidgets/jupyterlab_widgets/npm-debug.log

Here's the npm-debug.log file:
npm-debug.log.txt

Thanks for the great package. I appreciate any insight anyone might have!

Thanks,
Oliver

[OliverEvans96]

I ran it again not as root after:

pip uninstall widgetsnbextension ipywidgets

jupyter nbextension uninstall --py widgetsnbextension
jupyter nbextension uninstall --py --user widgetsnbextension
jupyter nbextension uninstall --py --sys-prefix widgetsnbextension

then run the dev-install instructions

As recommended by @SylvainCorlay in #662:

and it worked without issue!