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Ubuntu 18.04 LTS已提供下载，以下是各种Ubuntu 18.04版本下载地址。其中Desktop为桌面版本，Server为服务器版本，Kubuntu为使用KDE桌面的版本，Ubuntu Kylin为中国Ubuntu版，自带很多本土实用工具，我们推荐初用Ubuntu的用户优先选择该版本，它的升级进程和Ubuntu官方同步。
http://cdimage.ubuntu.com/daily-live/current/ (Ubuntu Desktop and debian-installer based Server) http://cdimage.ubuntu.com/ubuntu-server/daily-live/current (Ubuntu Live Server) http://cloud-images.ubuntu.com/daily/server/bionic/current/ (Ubuntu Cloud Images) http://cdimage.ubuntu.com/kubuntu/daily-live/current/ (Kubuntu) http://cdimage.ubuntu.com/lubuntu/daily-live/current/ (Lubuntu and Lubuntu Alternate) http://cdimage.ubuntu.com/ubuntu-budgie/daily-live/current/ (Ubuntu Budgie) http://cdimage.ubuntu.com/ubuntukylin/daily-live/current/ (Ubuntu Kylin) http://cdimage.ubuntu.com/ubuntu-mate/daily-live/current/ (Ubuntu MATE) http://cdimage.ubuntu.com/ubuntustudio/dvd/current/ (Ubuntu Studio) http://cdimage.ubuntu.com/xubuntu/daily-live/current/ (Xubuntu) 官网下载：https://www.ubuntu.com/download/desktop
从Ubuntu 16.04 LTS或者17.10升级到Ubuntu 18.04 LTS 以下内容为官网提供，原文。 1.To upgrade on a desktop system: Open the "Software & Updates" Setting in System Settings. Select the 3rd Tab called "Updates". Set the "Notify me of a new Ubuntu version" dropdown menu to "For any new version". Press Alt+F2 and type in "update-manager -cd" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release '18.04' is available. If not you can also use "/usr/lib/ubuntu-release-upgrader/check-new-release-gtk" Click Upgrade and follow the on-screen instructions. 2.To upgrade on a server system: Install the update-manager-core package if it is not already installed. Make sure the Prompt line in /etc/update-manager/release-upgrades is set to normal. Launch the upgrade tool with the command sudo do-release-upgrade -d. Follow the on-screen instructions. Note that the server upgrade will use GNU screen and automatically re-attach in case of dropped connection problems. There are no offline upgrade options for Ubuntu Desktop and Ubuntu Server. Please ensure you have network connectivity to one of the official mirrors or to a locally accessible mirror and follow the instructions above.
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