Ubuntu 13.04 (代号 Raring Ringtail) 正式版已发布，新版本包含Unity 7 / Libreoffice 4 /Upstart 1.8等等。

下载地址： http://releases.ubuntu.com/13.04/

Ubuntu 13.04 关键的改进内容包括：

• Faster Unity Desktop
• New Social Lens
• New Sync Menu
• Unity-style session dialogs
• Workspace item removed from launcher
• Updated Firefox, LibreOffice and File Manager, among others
• Linux kernel 3.8.8

更多下载地址：

http://releases.ubuntu.com/13.04/ (Ubuntu Desktop and Server)

http://cloud-images.ubuntu.com/releases/13.04/release/ (Ubuntu Cloud Server)

http://cdimage.ubuntu.com/netboot/13.04/ (Ubuntu Netboot)

http://cdimage.ubuntu.com/ubuntu-core/releases/13.04/release/ (Ubuntu Core)

http://cdimage.ubuntu.com/edubuntu/releases/13.04/release/ (Edubuntu DVD)

http://cdimage.ubuntu.com/kubuntu/releases/13.04/release/ (Kubuntu)

http://cdimage.ubuntu.com/lubuntu/releases/13.04/release/ (Lubuntu)

http://cdimage.ubuntu.com/ubuntustudio/releases/13.04/release/ (Ubuntu Studio)

http://cdimage.ubuntu.com/ubuntu-gnome/releases/13.04/release/ (Ubuntu-GNOME)

http://cdimage.ubuntu.com/ubuntukylin/releases/13.04/release/ (UbuntuKylin)

http://cdimage.ubuntu.com/xubuntu/releases/13.04/release/ (Xubuntu)

官方通告：https://wiki.ubuntu.com/RaringRingtail/TechnicalOverview