/usr/lib/ruby/2.3.0/tkextlib/tile/ is in ruby2.3-tcltk 2.3.0-5ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/2.3.0/tkextlib/tile/dialog.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/setup.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/sizegrip.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/style.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tbutton.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tcheckbutton.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tcombobox.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tentry.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tframe.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tlabel.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tlabelframe.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tmenubutton.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tnotebook.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tpaned.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tprogressbar.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tradiobutton.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/treeview.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tscale.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tscrollbar.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tseparator.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tspinbox.rb
/usr/lib/ruby/2.3.0/tkextlib/tile/tsquare.rb