Happens for me, too.  Ubuntu 16.04.02.  The installation stops before
the slideshow with the error message described above:
ubiquity.install_misc.InstallStepError: Plugin language failed with code
4.

I tried directly installing and installing from the LiveCD, both fail.  I 
executed the install link which was:
  
sh -c 'ubiquity gtk-ui' 

with the following modification:

sudo -c 'ubiquity gtk-ui'

and it worked completely.

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https://bugs.launchpad.net/bugs/1579454

Title:
  Ubuntu GNOME 16.04 runs ubiquity without root so it fails

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