/usr/lib/ruby/2.0.0/tkvirtevent.rb is in ruby2.0-tcltk 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #
# tkvirtevent.rb - load tk/virtevent.rb
#
require 'tk/virtevent'
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