16.04 LTS至18.04.1 LTS升级：未找到新版本
我无法让16.04 LTS到18.04.1 LTS升级工作，我正在运行服务器。
我目前的版本：
lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.5 LTS Release: 16.04 Codename: xenial 然而，尽管在7月26日发布了18.04.1，但目前在31日，我仍然被告知没有新版本？
我的/etc/update-manager/release-upgrades文件是：
# Default behavior for the release upgrader. [DEFAULT] # Default prompting behavior, valid options: # # never - Never check for a new release. # normal - Check to see if a new release is available. If more than one new # release is found, the release upgrader will attempt to upgrade to # the release that immediately succeeds the currently-running # release. # lts - Check to see if a new LTS release is available. The upgrader # will attempt to upgrade to the first LTS release available after # the currently-running one. Note that this option should not be # used if the currently-running release is not itself an LTS # release, since in that case the upgrader won't be able to # determine if a newer release is available. Prompt=lts
并且do-release-upgrade的输出：
Checking for a new Ubuntu release No new release found.
已安装更新管理器核心：
sudo apt install update-manager-core Reading package lists... Done Building dependency tree Reading state information... Done update-manager-core is already the newest version (1:16.04.13). 0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
请注意，这个问题与此处的问题截然不同我是否可以选择升级到18.04.1？ 因为该问题涉及基于GUI /桌面的情况，而这特别针对终端/服务器角度的问题。
从16.04 LTS升级到8月初发布的18.04.1发布后几天才会启用升级。 https://wiki.ubuntu.com/BionicBeaver/ReleaseSchedule