感谢山寨ugmbbc的投递
Ubuntu 10.04 的第一个beta版被推迟到明天发布。 Steve Langasek 在开发者邮件列表中描述了推迟的原因：由于一些镜像在重建的过程中存在一系列的重要Bug，我们不想把测试版的这些问题的留给用 户，我们对10.04 Beta 1的验证仍在继续。这意味着Beta 1将不会在本周四发布（当地时间，北京时间是周五）也就是2009年3月18日，它将于明日也就是3月19日公布。

The first beta of the Ubuntu 10.04 development cycle has been postponed until tomorrow.

In a message to the dev mailing list earlier this evening Steve Langasek states this the reason as: -

Owing to some late image rebuilds for a couple of critical issues that we
didn't want to leave our beta users subjected to, validation of 10.04 Beta 1
is still in progress.  This means that Beta 1 will not be released on
Thursday, March 18 as planned; it will be released tomorrow, March 19.