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/usr/share/calendar/calendar.ubuntu is in bsdmainutils 8.2.3ubuntu1.

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The actual contents of the file can be viewed below.

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/*
 * Interesting dates in Ubuntu history
 * Matt Zimmerman <mdz@ubuntu.com>, 2005-10-24
 */

#ifndef _calendar_ubuntu
#define _calendar_ubuntu

LANG=utf-8

/* Ubuntu releases */
Oct 20	Ubuntu 4.10 (Warty Warthog) released, 2004
Apr 08	Ubuntu 5.04 (Hoary Hedgehog) released, 2005
Oct 13	Ubuntu 5.10 (Breezy Badger) released, 2005
Jun 1	Ubuntu 6.06 LTS (Dapper Drake) released, 2006
Oct 26	Ubuntu 6.10 (Edgy Eft) released, 2006
Apr 19	Ubuntu 7.04 (Feisty Fawn) released, 2007
Oct 18	Ubuntu 7.10 (Gutsy Gibbon) released, 2007
Apr 24	Ubuntu 8.04 LTS (Hardy Heron) released, 2008
Oct 30	Ubuntu 8.10 (Intrepid Ibex) released, 2008
Apr 23	Ubuntu 9.04 (Jaunty Jackalope) released, 2009
Oct 29	Ubuntu 9.10 (Karmic Koala) released, 2009
Apr 29	Ubuntu 10.04 LTS (Lucid Lynx) released, 2010
Oct 10	Ubuntu 10.10 (Maverick Meerkat) released, 2010
Apr 28	Ubuntu 11.04 (Natty Narwhal) released, 2011

/* Misc */

#endif /* !_calendar_ubuntu_ */