More googling suggests this has to do with using bumblebee to use the
nvidia and intel GPUs. I used the following blog to install the nvidia
drivers.
http://lenovolinux.blogspot.nl/2016/05/bumblebee-on-lenovo-t440p-nvidia-
gt.html
I can now use either GPU at my disposal:
$ glxgears -info
Running
** Tags added: kubuntu
** Tags added: nvidia
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https://bugs.launchpad.net/bugs/1577041
Title:
Cannot login to kubuntu after upgrade
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