Transmageddon fails to start in ubuntu 15.10

Transmageddon doesn’t start in Ubuntu 15.10, running from the terminal, the output is as follows:

(transmageddon.py:14207): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:2040:33: 'theme_text_color' is not a valid color name
Traceback (most recent call last):
  File "transmageddon.py", line 141, in do_activate
    self.win = TransmageddonUI(self, source=self.source)
  File "transmageddon.py", line 320, in __init__
    self.setup_source()
  File "transmageddon.py", line 1352, in setup_source
    cdrom=theme.load_icon(Gtk.STOCK_CDROM, size, 0)
GLib.Error: gtk-icon-theme-error-quark: Icon 'gtk-cdrom' not present in theme Ultra-Flat (0)