LOG.jhub.update

jupyter labextension list
pip3 install -U jupyterlab-git
pip3 install -U jupyterlab-latex
pip3 install --force-reinstall 'jupyterlab==1.2.7'
pip3 install --force-reinstall 'jupyterhub==1.1.0'
jupyter labextension update --all
jupyter lab build

# pip3 list |grep jupyter[hl] 
jupyterhub         1.1.0     
jupyterlab         1.2.7     
jupyterlab-git     0.9.0     
jupyterlab-latex   2.0.0     
jupyterlab-server  1.0.7     

# jupyter-labextension list
JupyterLab v1.2.7
Known labextensions:
   app dir: /usr/local/share/jupyter/lab
        @jupyterlab/git v0.9.0  enabled  OK
        @jupyterlab/latex v1.0.0  enabled  OK
        nbdime-jupyterlab v1.0.0  enabled  OK

# jupyter-serverextension list
config dir: /usr/local/etc/jupyter
    ipyparallel.nbextension  enabled 
    - Validating...
      ipyparallel.nbextension  OK
    jupyterlab  enabled 
    - Validating...
      jupyterlab 1.2.7 OK
    jupyterlab_git  enabled 
    - Validating...
      jupyterlab_git  OK
    jupyterlab_latex  enabled 
    - Validating...
      jupyterlab_latex 2.0.0 OK
    nbdime  enabled 
    - Validating...
      nbdime 2.0.0 OK