Ubuntu 9.10 is coming
To upgrade from Ubuntu 9.04 on a desktop system, press Alt+F2 and type in “update-manager -d” (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release ‘9.10′ is available. Click Upgrade and follow the on-screen instructions.
To upgrade from Ubuntu 9.04 on a server system: install the update-manager-core package if it is not already installed; edit/etc/update-manager/release-upgrades and setPrompt=normal; launch the upgrade tool with the commandsudo do-release-upgrade -d; and follow the on-screen instructions.
来源：Ubuntu
发现我升级的失败的时候正好发布beta版本。
