/usr/share/pyshared/IPython/frontend/html/notebook/static/jquery/css/themes/smoothness/jquery-ui-1.8.14.custom.css is in ipython-notebook 0.12.1+dfsg-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/pyshared/IPython/frontend/html/notebook/static/jquery/css/themes/smoothness/../../../../../../../../../../javascript/jquery-ui/css/smoothness/jquery-ui.css