Do-Release-Upgrade 返回“未找到新版本”

Do-Release-Upgrade 返回“未找到新版本”

我目前正在运行 14.04 LTS Ubuntu 服务器,我想将其升级到 16.04。我已经安装了该update-manager-core工具并将其设置为搜索 LTS 版本,但它每次都返回“未找到新版本”。

daniel@Owncloud:~$ sudo do-release-upgrade -d -s
Checking for a new Ubuntu release
No new release found

daniel@Owncloud:~$ cat /etc/update-manager/release-upgrades
# 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

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