Ubuntu 9.04今天迈出了正式发布前的最后一大步：RC候选版已经出炉。
Ubuntu 9.04 RC基于2.6.28-11.37版Linux系统内核，集成了X.Org server 1.6和最新版桌面环境GNOME 2.26，后者包括Philippe Rouquier和Luis Medinas开发的多合一CD刻录程序Brasero 2.26.0，并在Nautilus文件管理器中作为默认的光盘刻录程序，另外还有Federico Mena Quintero开发的经过升级的“gnome-display-properties”(显示属性)，能更好地管理多显输出。
其它主要特性：Wacom手写板插入后自动直接启用，无需再修改xorg.conf；集成Turn-Key邮件服务器，支持SMTP、POP3、 IMAP、TLS、SASL；提升启动性能、支持Ext4文件系统、新的通知样式和参数、云计算等则都是Alpha和Beta阶段就有的了。
Ubuntu 9.04最终正式版将在下周23日放出。如果你等不及了，可以先行体验RC版：
http://www.ubuntu.com/getubuntu/releasenotes/904overview#Download
来自驱动之家
下面是来自uBuntu官方网站的介绍：
New features since Ubuntu 8.10
GNOME 2.26
Ubuntu 9.04 RC includes the latest GNOME 2.26 desktop environment with a number of great new features, including:
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brasero, version 2.26.0, developed by Philippe Rouquier and Luis Medinas, as an all-in-one CD burning application. Brasero is now the default disc burning utility in Nautilus.
X.Org server 1.6
The latest X.Org server, version 1.6, is available in Jaunty. The latest Mesa 3D DRI, version 7.4, is also available. A number of video cards have been transitioned to free drivers as part of these updates.
The -ati driver has received numerous fixes and performance improvements. It now uses the EXA acceleration method by default. 2D acceleration support for the newest R6xx/R7xx family of cards is also available. 3D support is available up to R5xx cards for -ati. An updated -fglrx proprietary driver is available for R6xx/R7xx users who need 3D support.
The -intel driver now uses GEM for memory management. The new UXA acceleration architecture and DRI2 is available as an option.
Wacom tablet hotplugging
Wacom tablets now are enabled automatically when attached, no longer requiring xorg.conf modification. Button mapping configuration is not yet supported, but can be set manually by adding an fdi file to /etc/ha/fdi/policy/.
New style for notifications and notification preferences
Included in Jaunty is a simple menu which can be used to set preferences for notification icons, such as where they pop up on the taskbar. Ubuntu 9.04 beta also includes a whole new notification system, as shown in the Flash movie here:
http://www.markshuttleworth.com/wp-content/uploads/2008/12/jaunty904_notifications_example1_web_092.swf
A number of improvements to the Ubuntu start-up process bring significantly improved boot performance to Ubuntu 9.04 RC. Please open bugs if you experience any degradation, and tag them with boot-performance.
Linux kernel 2.6.28
Ubuntu 9.04 RC includes the 2.6.28-11.37 kernel based on 2.6.28.8.
Ext4 filesystem support
Ubuntu 9.04 RC supports the option of installing the new ext4 file system. ext3 will remain the default filesystem for Jaunty, and we will consider ext4 as the default for the next release based on user feedback. There has been extensive discussion about the reliability of applications running on ext4 in the face of sudden system outages. Applications that use the conventional approach of writing data to a temporary file and renaming it to its final location will have their reliability expectations met in Ubuntu 9.04 beta; further discussion is ongoing in the kernel community.
Ext4 support in GRUB was provided by Colin King. If you choose to upgrade your / or /boot filesystem in place from ext2 or ext3 to ext4 (as documented on the ext4 wiki), then you must also use the grub-install command after upgrading to Ubuntu 9.04 RC to reinstall your boot loader. If you do not do this, then the version of GRUB installed in your boot sector will not be able to read the kernel from the ext4 filesystem and your system will fail to boot.
Ext4 support in gparted has been provided by Curtis Gedak.
Cloud computing
Ubuntu 9.04 Server Edition makes it easy to experiment with cloud computing. Eucalyptus, an open source technology which is included in Ubuntu as a technology preview, enables you to use your own servers to deploy, experiment and test your own private cloud that matches the Amazon EC2 API. You can dynamically create virtual machines, configure multiple clusters into a single Cloud and even provide an EBS (elastic block storage) equivalent and an S3 compatible storage manager.
Turn-key mail servers
The dovecot-postfix package in Ubuntu 9.04 RC provides an easy-to-deploy mail server stack, with support for SMTP, POP3, and IMAP with TLS and SASL.
dovecot-postfix was packaged by Ante Karamatić.
Known issues
There are a small number of known bugs that users may run into with Ubuntu 9.04 RC which will be fixed before the final release. We have documented them here for your convenience along with any known workarounds.
For a full list of errata for Ubuntu 9.04, please see the Ubuntu 9.04 release notes.
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When using the ext4 filesystem, accessing large files can trigger a kernel panic and filesystem corruption. The fix for this problem will be included in the final 9.04 release. Users installing from the Ubuntu 9.04 Release Candidate may wish to avoid this problem by using the default ext3 filesystem and converting it to ext4 after release. 348836.
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The OEM setup mode is not usable in the Kubuntu release candidate. This will be corrected for the final release. 361665.
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The mythtv frontend in mythbuntu fails to render fonts correctly when using video drivers other than the Intel or closed-source nVidia drivers. This issue is expected to be resolved for the final 9.04 release. 341898
Participate in Ubuntu
If you would like to help shape Ubuntu, take a look at the list of ways you can participate at
Help Spread the Word About Ubuntu 9.04
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