Xbuntu中的lsb_release显示17.04 Zesty Zapus(开发分支)

我一个月前安装了Xubuntu 16.10。 现在我的系统显示我正在运行17.04(开发分支)。

$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu Zesty Zapus (development branch) Release: 17.04 Codename: zesty 

我认为我不允许系统升级到最新的预发布版本。 Ubuntu的软件和更新也不会打开。 这里:

 $ software-properties-gtk aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Ubuntu/zesty 

System的sources.list显示软件包是从yakkety存储库安装的。

 # deb cdrom:[Xubuntu 16.10 _Yakkety Yak_ - Release amd64 (20161012.2)]/ yakkety main multiverse restricted universe # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://in.archive.ubuntu.com/ubuntu/ yakkety main restricted # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://in.archive.ubuntu.com/ubuntu/ yakkety-updates main restricted # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety-updates main restricted ## NB software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://in.archive.ubuntu.com/ubuntu/ yakkety universe # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety universe deb http://in.archive.ubuntu.com/ubuntu/ yakkety-updates universe # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety-updates universe ## NB software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://in.archive.ubuntu.com/ubuntu/ yakkety multiverse # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety multiverse deb http://in.archive.ubuntu.com/ubuntu/ yakkety-updates multiverse # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety-updates multiverse ## NB software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://in.archive.ubuntu.com/ubuntu/ yakkety-backports main restricted universe multiverse # deb-src http://in.archive.ubuntu.com/ubuntu/ yakkety-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu yakkety partner # deb-src http://archive.canonical.com/ubuntu yakkety partner deb http://security.ubuntu.com/ubuntu yakkety-security main restricted # deb-src http://security.ubuntu.com/ubuntu yakkety-security main restricted deb http://security.ubuntu.com/ubuntu yakkety-security universe # deb-src http://security.ubuntu.com/ubuntu yakkety-security universe deb http://security.ubuntu.com/ubuntu yakkety-security multiverse # deb-src http://security.ubuntu.com/ubuntu yakkety-security multiverse 

有谁可以帮我解决这个问题? 我不明白为什么我的系统显示17.04虽然我安装了16.10。

参考我的电脑说我正在运行ubuntu 17.04 ,这是输出

apt-cache policy base-files

 base-files: Installed: 9.6ubuntu6 Candidate: 9.6ubuntu6 Version table: *** 9.6ubuntu6 500 500 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu yakkety/main amd64 Packages 100 /var/lib/dpkg/status 9.6ubuntu5 500 500 http://in.archive.ubuntu.com/ubuntu yakkety/main amd64 Packages