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Jupyterlab/plotly-extension won't install

Jupyterlab 0.31.8
Ubuntu 14.04
Plotly 3.0.0

I’m trying to install the Plotly jupyterlab extension.


jupyter labextension install @jupyterlab/plotly-extension --debug

results in

> /usr/bin/npm pack @jupyterlab/plotly-extension
npm ERR! git clone Cloning into bare repository '/home/ubuntu/.npm/_git-remotes/git-github-com-jupyterlab-plotly-extension-8ab9f472'...
npm ERR! git clone Permission denied (publickey).
npm ERR! git clone fatal: Could not read from remote repository.
npm ERR! git clone
npm ERR! git clone Please make sure you have the correct access rights
npm ERR! git clone and the repository exists.
npm ERR! addLocal Could not install jupyterlab/plotly-extension
npm ERR! Error: ENOENT, stat 'jupyterlab/plotly-extension'
npm ERR! If you need help, you may report this *entire* log,
npm ERR! including the npm and node versions, at:
npm ERR!     <>

npm ERR! System Linux 3.13.0-144-generic
npm ERR! command "/usr/bin/node" "/usr/bin/npm" "pack" "@jupyterlab/plotly-extension"
npm ERR! cwd /tmp/tmp0ce5jqp6
npm ERR! node -v v0.10.37
npm ERR! npm -v 1.4.28
npm ERR! path jupyterlab/plotly-extension
npm ERR! code ENOENT
npm ERR! errno 34
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     /tmp/tmp0ce5jqp6/npm-debug.log
npm ERR! not ok code 0
Traceback (most recent call last):

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 71, in start
ans = self.run_task()

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 100, in run_task
for arg in self.extra_args

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 100, in <listcomp>
for arg in self.extra_args

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 210, in install_extension
return handler.install_extension(extension)

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 347, in install_extension
info = self._install_extension(extension, tempdir)

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 1095, in _install_extension
info = self._extract_package(extension, tempdir)

  File "/usr/local/anaconda3/lib/python3.5/site-packages/jupyterlab/", line 1135, in _extract_package
raise ValueError(msg % source)

ValueError: "@jupyterlab/plotly-extension" is not a valid npm package

Errored, use --debug for full output:
ValueError: "@jupyterlab/plotly-extension" is not a valid npm package

What I tried was the standard recommendation found here

What should I do differently?

Note: I also posted this question on Stack Overflow