The official Ubuntu 10.04 version will be released today. Due to the time difference, you should be able to see the message on the official website tonight. Files are being distributed. According to the previous distribution address of ubuntu and MD5SUM, the latest address of Ubuntu 10.04 is:
Desktop:
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-desktop-amd64.iso
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-desktop-i386.iso
Server version:
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-server-amd64.iso
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-server-i386.iso
Other Versions:
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-alternate-i386.iso
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-alternate-amd64.iso
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-netbook-armel+dove.img
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-netbook-armel+imx51.img
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-alternate-amd64.iso
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-alternate-i386.iso
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-netbook-armel+dove.img
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-netbook-armel+imx51.img
Http://releases.ubuntu.com/releases/.pool/ubuntu-10.04-netbook-i386.iso
You can download the SDK by following these steps ~~~, We recommend that you download it after the official release to avoid overload on the distribution server.